Publication
2020
Miyu Sasaki, Linh Tran Bao Nguyen, Soshi Yabumoto, Tatsuo Nakagawa, Manabu Abe
Structural Transformation of 2-(p-Aminophenyl)-1-hydroxyinden-3-ylmethyl Chromophore as a Photoremovable Protecting Group
(2020) ChemPhotoChem, in press, DOI: 10.1002/cptc.202000149
Sujan K. Sarkar, Ephrath Solel, Sebastian Kozuch, Manabu Abe
Heavy-Atom Tunneling Processes during Denitrogenation of 2,3-Diazabicyclo[2.2.1]hept-2-ene and Ring Closure of Cyclopentane-1,3-diyl Diradical. Stereoselectivity in Tunneling and Matrix Effect
(2020) The Journal of Organic Chemistry, in press, 10.1021/acs.joc.0c00763
Sujan Kumar Sarkar and Manabu Abe
Benzophenone
(2020) Encyclopedia of Reagents for Organic Synthesis, in press
Reactivity and Product Analysis of a Pair of Cumyloxyl and tert-Butoxyl Radicals Generated in Photolysis of tert-Butyl Cumyl Peroxide
(2020) The Journal of Organic Chemistry, in press, 10.1021/acs.joc.0c00763
Oyama, Ryoko; Abe, Manabu
Dian Agung Pangaribowo and Manabu Abe
Photochemical [2 + 2] Cycloaddition Reaction of Carbonyl Compounds with Danishefsky Diene
(2020) Organic & Biomolecular Chemistry, in press. DOI: 10.1039/d0ob00921k
Elisa M. Brás, Lília I. L. Cabral, Patrícia S. M. Amado, Manabu Abe, Rui Fausto, Maria L. S. Cristiano
Photoinduced Reactivity in a Dispiro-1,2,4-trioxolane: Adamantane Ring Expansion and First Direct Observation of the Long-Lived Triplet Diradical Intermediates
(2020) The Journal of Physical Chemistry A, 124 (21), pp. 4202-4210. doi.org/10.1021/acs.jpca.0c01974
Sahara, K., Abe, M., Zipse, H., Kubo, T.
Duality of Reactivity of a Biradicaloid Compound with an o-Quinodimethane Scaffold
(2020) Journal of the American Chemical Society, 142 (11), pp. 5408-5418. DOI: 10.1021/jacs.0c01003
Ishida, K., Yamazaki, H., Hagiwara, C., Abe, M., Kusama, H.
Efficient Generation and Synthetic Applications of Alkyl-Substituted Siloxycarbenes: Suppression of Norrish-Type Fragmentations of Alkanoylsilanes by Triplet Energy Transfer
(2020) Chemistry - A European Journal, 26 (6), pp. 1249-1253. DOI: 10.1002/chem.201904635
Yoshida, H., Seki, M., Kamio, S., Tanaka, H., Izumi, Y., Li, J., Osaka, I., Abe, M., Andoh, H., Yajima, T., Tani, T., Tsuchimoto, T.
Direct suzuki-miyaura coupling with naphthalene-1,8-diaminato (dan)-substituted organoborons
(2020) ACS Catalysis, 10 (1), pp. 346-351. DOI: 10.1021/acscatal.9b03666
Ismael, A., Abe, M., Fausto, R., Cristiano, M.L.S.
Insights into the photochemistry of 5-aminotetrazole derivatives with applications in coordination chemistry. effect of the saccharyl moiety on the photostability
(2020) Pure and Applied Chemistry, 92 (1), pp. 49-62. DOI: 10.1515/pac-2019-0402
2019
Akisaka, R., Abe, M.
Bulky Substituent Effect on Reactivity of Localized Singlet Cyclopentane-1,3-diyls with π-Single Bonding (C-π-C) Character (2019) Chemistry - An Asian Journal, 14 (23), pp. 4223-4228. DOI: 10.1002/asia.201901253
Yang, Y., Deng, G., Lu, Y., Liu, Q., Abe, M., Zeng, X.
Photodecomposition of Thienylsulfonyl Azides: Generation and Spectroscopic Characterization of Triplet Thienylsulfonyl Nitrenes and 3-Thienylnitrene (2019) Journal of Physical Chemistry A, 123 (43), pp. 9311-9320. DOI: 10.1021/acs.jpca.9b03740
Shields, D.J., Sarkar, S.K., Sriyarathne, H.D.M., Brown, J.R., Wentrup, C., Abe, M., Gudmundsdottir, A.D.
Transforming Triplet Vinylnitrene into Triplet Alkylnitrene at Cryogenic Temperatures (2019) Organic Letters, 21 (18), pp. 7194-7198. DOI: 10.1021/acs.orglett.9b01950
Li, X., Ogihara, T., Abe, M., Nakamura, Y., Yamago, S.
The Effect of Viscosity on the Diffusion and Termination Reaction of Organic Radical Pairs (2019) Chemistry - A European Journal, 25 (42), pp. 9846-9850. DOI: 10.1002/chem.201902074
Gatlin, D.M., Karney, W.L., Abe, M., Ault, B.S., Gudmundsdottir, A.D.
Formation and Reactivity of Triplet Vinylnitrenes as a Function of Ring Size(2019) Journal of Organic Chemistry, 84 (14), pp. 9215-9225. DOI: 10.1021/acs.joc.9b01191
Yamato, K., Sekiya, R., Abe, M., Haino, T.
Separation of Spectroscopically Uniform Nanographenes(2019) Chemistry - An Asian Journal, 14 (10), pp. 1786-1791. DOI: 10.1002/asia.201801632
Yakiyama, Y., Wang, Y., Hatano, S., Abe, M., Sakurai, H.
Generation of "Sumanenylidene": A Ground-State Triplet Carbene on a Curved π-Conjugated Periphery
(2019) Chemistry - An Asian Journal, 14 (10), pp. 1844-1848. DOI: 10.1002/asia.201801802
Yamada, A., Abe, M., Nishimura, Y., Ishizaka, S., Namba, M., Nakashima, T., Shimoji, K., Hattori, N.
Photochemical generation of the 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) radical from caged nitroxides by near-infrared two-photon irradiation and its cytocidal effect on lung cancer cells (2019) Beilstein Journal of Organic Chemistry, 15, pp. 863-873. DOI: 10.3762/bjoc.15.84
Yoshidomi, S., Abe, M.
1,2-Diazacyclopentane-3,5-diyl Diradicals: Electronic Structure and Reactivity
(2019) Journal of the American Chemical Society, 141 (9), pp. 3920-3933. DOI: 10.1021/jacs.8b12254
Matsumoto, M., Antol, I., Abe, M.
Curve Effect on Singlet Diradical Contribution in Kekulé-type Diradicals: A sensitive probe for quinoidal structure in curved π-conjugated molecules
(2019) Molecules, 24 (1), art. no. 209, .DOI: 10.3390/molecules24010209
Abe, M.
Generation of extremely long-lived localized singlet diradicals: New insights into bond-homolysis process and discovery of novel bonding system (C-π-C)
(2019) Yuki Gosei Kagaku Kyokaishi/Journal of Synthetic Organic Chemistry, 77 (5), pp. 503-511. DOI: 10.5059/yukigoseikyokaishi.77.503
Chitose, Y., Abe, M.
Design and synthesis of two-photon responsive chromophores for application to uncaging reactions
(2019) Photochemistry, 46, pp. 221-241. DOI: 10.1039/9781788013598-00219
Shields, D.J., Sarkar, S.K., Sriyarathne, H.D.M., Brown, J.R., Wentrup, C., Abe, M., Gudmundsdottir, A.D.
Transforming triplet vinylnitrene into triplet alkylnitrene at cryogenic temperatures
(2019) Organic Letters, DOI: 10.1021/acs.orglett.9b01950
2018Caged Compounds for Two-Photon UncagingJakkampudi, S.; Abe, M.in Elsevier Reference Module in Chemistry, Molecular Sciences and Chemical Engineering 2018, Chapter 13667.
Chloro- and Dichloro-methylsulfonyl Nitrenes: Spectroscopic characterization, photoisomerization, and thermal decompositionYang, Y., Chu, X., Lu, Y., Abe, M., Zeng, X.Molecules, 2018, 23 (12), art. no. 3312,
Methoxyphosphinidene and Isomeric Methylphosphinidene OxideChu, Xianxu; Yang, Yang; Lu, Bo; Wu, Zhuang; Qian, Weiyu; Song, Chao; Xu, Xinfang; Abe, Manabu; Zeng, XiaoqingJOURNAL OF THE AMERICAN CHEMICAL SOCIETY 140(42) 13604-13608 Oct 2018
Extremely Long Lived Localized Singlet Diradicals in a Macrocyclic Structure: A Case Study on the Stretch EffectHarada, Yuta; Wang, Zhe; Kumashiro, Shunsuke; Hatano, Sayaka; Abe, ManabuCHEMISTRY-A EUROPEAN JOURNAL 24(55) 14808-14815 Oct 2018
Triplet States of Tetrazoles, Nitrenes, and Carbenes from Matrix Photolysis of Tetrazoles, and Phenylcyanamide as a Source of PhenylnitreneAbe, Manabu; Begue, Didier; Silva, Hugo Santos; Dargelos, Alain; Wentrup, CurtJOURNAL OF PHYSICAL CHEMISTRY A 122(37) 7276-7283 Sep 2018
Anthranilamide (aam)-substituted diboron: palladium-catalyzed selective B(aam) transferKamio, Shintaro; Kageyuki, Ikuo; Osaka, Itaru; Hatano, Sayaka; Abe, Manabu; Yoshida, HirotoCHEMICAL COMMUNICATIONS 54(67) 9290-9293 Aug 2018
Sulfamoyl nitrenes: singlet or triplet ground state?Lu, Yan; Li, Hongmin; Abe, Manabu; Begue, Didier; Wan, Huabin; Deng, Guohai; Xu, Jian; Liu, Kun; Zeng, XiaoqingCHEMICAL COMMUNICATIONS 54(48) 6136-6139 Jun 2018
Selective Probing of Potassium Ion in Solution by Intramolecular Excimer Fluorescence of Dibenzo-Crown EthersKida, Motoki; Kub, Mayuko; Ujihira, Tomoyuki; Ebata, Takayuki; Abe, Manabu; Inokuchi, YoshiyaCHEMPHYSCHEM 19(11) 1331-1335 Jun 2018
Unusually Long-Wavelength Emissions of Cyclopropanes: New Insight into C-C Bond HomolysisAbe, Manabu; Kanahara, Kousei; Kadowaki, Norito; Tan, Chun-Jui; Tsai, Hui-Hsu GavinCHEMISTRY-A EUROPEAN JOURNAL 24(30) 7595-7600 May 2018
Direct Observation of an Imidoylnitrene: Photochemical Formation of PhC(=NMe)-N and Me-N from 1-Methyl-5-phenyltetrazoleAbe, Manabu; Begue, Didier; Santos-Silva, Hugo; Dargelos, Alain; Wentrup, CurtANGEWANDTE CHEMIE-INTERNATIONAL EDITION 57(12) 3212-3216 Mar 2018
Experimental Observation of Thermally Excited Triplet States of Heavier Group 15 Element Centered Diradical DianionsFang, Yong; Zhang, Li; Cheng, Cheng; Zhao, Yue; Abe, Manabu; Tan, Gengwen; Wang, XinpingCHEMISTRY-A EUROPEAN JOURNAL 24(13) 3156-3160 Mar 2018
Photochemically Induced Intramolecular Radical Cyclization Reactions with IminesLefebvre, Corentin; Michelin, Clement; Martzel, Thomas; Mvondo, Vaneck Djou'ou; Bulach, Veronique; Abe, Manabu; Hoffmann, NorbertJOURNAL OF ORGANIC CHEMISTRY 83(4) 1867-1875 Feb 2018
Magnetically Bistable Nitrenes: Matrix Isolation of Furoylnitrenes in Both Singlet and Triplet States and Triplet 3-FurylnitreneFeng, Ruijuan; Lu, Yan; Deng, Guohai; Xu, Jian; Wu, Zhuang; Li, Hongmin; Liu, Qian; Kadowki, Norito; Abe, Manabu; Zeng, XiaoqingJOURNAL OF THE AMERICAN CHEMICAL SOCIETY 140(1) 10-13 Jan 2018
Photochemical [2+2] cycloaddition reaction of enone derivatives with 2-siloxy-1H-pyrrole derivativesXue, Jianfei; Takagi, Ryukichi; Abe, ManabuARKIVOC 192-204 2018
2017Fast Heavy-Atom Tunneling in Trifluoroacetyl NitreneWu, Zhuang; Feng, Ruijuan; Li, Hongmin; Xu, Jian; Deng, Guohai; Abe, Manabu; Begue, Didier; Liu, Kun; Zeng, XiaoqingANGEWANDTE CHEMIE-INTERNATIONAL EDITION 56(49) 15672-15676 Dec 2017
Artocarmins G-M, Prenylated 4-Chromenones from the Stems of Artocarpus rigida and Their Tyrosinase Inhibitory ActivitiesNguyen, Mai T. T.; Le, Tho H.; Nguyen, Hai X.; Dang, Phu H.; Do, Truong N. V.; Abe, Manabu; Takagi, Ryukichi; Nguyen, Nhan T.JOURNAL OF NATURAL PRODUCTS 80(12) 3173-3179 Dec 2017
Contrasting Photolytic and Thermal Decomposition of Phenyl Azidoformate: The Curtius Rearrangement Versus Intramolecular C-H AminationWan, Huabin; Xu, Jian; Liu, Qian; Li, Hongmin; Lu, Yan; Abe, Manabu; Zeng, XiaoqingJOURNAL OF PHYSICAL CHEMISTRY A 121(45) 8604-8613 Nov 2017
Is π-Single Bonding (C-π-C) Possible? A Challenge in Organic ChemistryAbe, Manabu; Akisaka, RikuoCHEMISTRY LETTERS 46(11) 1586-1592 Nov 2017
Two ring opened oxetane taxoids containing a C-20 benzoyloxy group from the roots of Taxus wallichiana Zucc.Dang, Phu H.; Nguyen, Hanh H. T.; Truong, Hien T. T.; Do, Truong N. V.; Nguyen, Hai X.; Nguyen, Mai T. T.; Abe, Manabu; Takagi, Ryukichi; Nguyen, Nhan T.TETRAHEDRON LETTERS 58(40) 3897-3900 Oct 2017
Laser flash photolysis of nanocrystalline alpha-azidop-methoxy-p-acetophenoneSarkar, Sujan K.; Gatlin, DeVonna M.; Das, Anushree; Loftin, Breyinn; Krause, Jeanette A.; Abe, Manabu; Gudmundsdottir, Anna D.ORGANIC & BIOMOLECULAR CHEMISTRY 15(35) 7380-7386 Sep 2017
N-Methylcarbamoyl azide: spectroscopy, X-ray structure and decomposition via methylcarbamoyl nitreneWan, Huabin; Li, Hongmin; Xu, Jian; Wu, Zhuang; Liu, Qifan; Chu, Xianxu; Abe, Manabu; Begue, Didier; Zeng, XiaoqingORGANIC CHEMISTRY FRONTIERS 4(9) 1839-1848 Sep 2017
Computational study on 1,3-disilacyclobutane-1,3-diylidene disilylenes: A synthetic strategy for cis-bent disilenesFujita, Yoshiki; Abe, ManabuJOURNAL OF PHYSICAL ORGANIC CHEMISTRY 30(9) Sep 2017
B(MIDA)-Containing DiboronsYoshida, Hiroto; Seki, Michinari; Kageyuki, Ikuo; Osaka, Itaru; Hatano, Sayaka; Abe, ManabuACS OMEGA 2(9) 5911-5916 Sep 2017
Design and Synthesis of Two-Photon Responsive Chromophores for Near-Infrared Light-Induced Uncaging ReactionsAbe, Manabu; Chitosea, Youhei; Jakkampudi, Satish; Thuy, Pham Thi Thu; Lin, Qianghua; Van, Bui Thi; Yamada, Ayato; Oyama, Ryoko; Sasaki, Miyu; Katan, ClaudineSYNTHESIS-STUTTGART 49(15) 3337-3346 Aug 2017
Mechanistic study of stereoselectivity in azoalkane denitrogenationsAbe, Manabu; Hatano, SayakaPURE AND APPLIED CHEMISTRY 89(6) 759-764 Jun 2017
Design and Synthesis of a Caged Carboxylic Acid with a Donor-pi-Donor Coumarin Structure: One-photon and Two-photon Uncaging Reactions Using Visible and Near-Infrared LightsChitose, Youhei; Abe, Manabu; Furukawa, Ko; Ling, Jhe-Yi; Lin, Tzu-Chau; Katan, ClaudineORGANIC LETTERS 19(10) 2622-2625 May 2017
Direct observation of methoxycarbonylnitreneLi, Hongmin; Wu, Zhuang; Li, Dingqing; Wan, Huabin; Xu, Jian; Abe, Manabu; Zeng, XiaoqingCHEMICAL COMMUNICATIONS 53(35) 4783-4786 May 2017
Suplatast tosilate protects the lung against hyperoxic lung injury by scavenging hydroxyl radicalsFukuhara, Kazuhide; Nakashima, Taku; Abe, Manabu; Masuda, Takeshi; Hamad, Hironobu; Iwarnoto, Hiroshi; Fujitaka, Kazunori; Kohno, Nobuoki; Hattori, NoboruFREE RADICAL BIOLOGY AND MEDICINE 106 1-9 May 2017
Photolysis of 3,5-diphenylisoxazole in argon matricesSriyarathne, H. Dushanee M.; Sarkar, Sujan K.; Hatano, Sayaka; Abe, Manabu; Gudmundsdottir, Anna D.JOURNAL OF PHYSICAL ORGANIC CHEMISTRY 30(4) Apr 2017
Paterno-Buchi photochemical [2+2] cycloaddition of aromatic carbonyl compounds with 2-siloxy-1H-pyrrole derivatives(dagger)Xue, Jianfei; Abe, Manabu; Takagi, RyukichiJOURNAL OF PHYSICAL ORGANIC CHEMISTRY 30(4) Apr 2017
Direct Detection of a Chemical Equilibrium between a Localized Singlet Diradical and Its sigma-Bonded Species by Time-Resolved UV/Vis and IR SpectroscopyYoshidomi, Shohei; Mishima, Megumi; Seyama, Shin; Abe, Manabu; Fujiwara, Yoshihisa; Ishibashi, Taka-akiANGEWANDTE CHEMIE-INTERNATIONAL EDITION 56(11) 2984-2988 Mar 2017
Control of the Termination Mechanism in Radical Polymerization by Viscosity: Selective Disproportionation in Viscous MediaNakamura, Yasuyuki; Ogihara, Tasuku; Hatano, Sayaka; Abe, Manabu; Yamago, ShigeruCHEMISTRY-A EUROPEAN JOURNAL 23(6) 1299-1305 Jan 2017
Light-harvesting organogel based on tris(phenylisoxazolyl)benzeneIkeda, Toshiaki; Ueda, Yuko; Komori, Naomitsu; Abe, Manabu; Haino, TakeharuSUPRAMOLECULAR CHEMISTRY 29(6) 471-476 2017
2016The structure of electronically excited ,-unsaturated lactonesFreneau, Maxime; de Sainte-Claire, Pascal; Abe, Manabu; Hoffmann, NorbertJOURNAL OF PHYSICAL ORGANIC CHEMISTRY 29(12) 718-724 Dec 2016
Using Molecular Architecture to Control the Reactivity of a Triplet VinylnitreneSarkar, Sujan K.; Osisioma, Onyinye; Kamey, William L.; Abe, Manabu; Gudmundsdottir, Anna D.JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 138(45) 14905-14914 Nov 2016
Design, Synthesis, and Reaction of pi-Extended Coumarin-based New Caged Compounds with Two-photon Absorption Character in the Near-IR RegionChitose, Youhei; Abe, Manabu; Furukawa, Ko; Katan, ClaudineCHEMISTRY LETTERS 45(10) 1186-1188 Oct 2016
Design and Synthesis of a 4-Nitrobromobenzene Derivative Bearing an Ethylene Glycol Tetraacetic Acid Unit for a New Generation of Caged Calcium Compounds with Two-Photon Absorption Properties in the Near-IR Region and Their Application in VivoJakkampudi, Satish; Abe, Manabu; Komori, Naomitsu; Takagi, Ryukichi; Furukawa, Ko; Katan, Claudine; Sawada, Wakako; Takahashi, Noriko; Kasai, HaruoACS OMEGA 1(2) 193-201 Aug 2016
Impact of Diradical Spin State (Singlet vs Triplet) and Structure (Puckered vs Planar) on the Photodenitrogenation Stereoselectivity of 2,3-Diazabicyclo[2.2.1]heptanesAbe, Manabu; Tada, Saori; Mizuno, Takemi; Yamasaki, KatsuyoshiJOURNAL OF PHYSICAL CHEMISTRY B 120(29) 7217-7226 Jul 2016
Computational Study of Cyclobutane-1,3-diylidene Dicarbenes: Ground-State Spin Multiplicity and New Strategy toward the Synthesis of Bicyclo[1.1.0]but-1(3)-enesFujita, Yoshiki; Abe, Manabu; Shiota, Yoshihito; Suzuki, Tatsuya; Yoshizawa, KazunariBULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 89(7) 770-778 Jul 2016
Biphenalenylidene: Isolation and Characterization of the Reactive Intermediate on the Decomposition Pathway of Phenalenyl RadicalUchida, Kazuyuki; Ito, Soichi; Nakano, Masayoshi; Abe, Manabu; Kubo, TakashiJOURNAL OF THE AMERICAN CHEMICAL SOCIETY 138(7) 2399-2410 Feb 2016
A Puckered Singlet Cyclopentane-1,3-diyl: Detection of the Third Isomer in HomolysisYe, Jianhuai; Hatano, Sayaka; Abe, Manabu; Kishi, Ryohei; Murata, Yusuke; Nakano, Masayoshi; Adam, WaldemarCHEMISTRY-A EUROPEAN JOURNAL 22(7) 2299-2306 Feb 2016
Design and synthesis of a new chromophore, 2-(4-nitrophenyl)benzofuran, for two-photon uncaging using near-IR lightKomori, Naomitsu; Jakkampudi, Satish; Motoishi, Ryusei; Abe, Manabu; Kamada, Kenji; Furukawa, Ko; Katan, Claudine; Sawada, Wakako; Takahashi, Noriko; Kasai, Haruo; Xue, Bing; Kobayashi, TakayoshiCHEMICAL COMMUNICATIONS 52(2) 331-334 2016
2015Intra- and Intermolecular Reactivity of Triplet SumanenetrioneKanahara, Kousei; Badal, M. D. Mizanur Rahman; Hatano, Sayaka; Abe, Manabu; Higashibayashi, Shuhei; Takashina, Naoto; Sakurai, HidehiroBULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 88(11) 1612-1617 Nov 2015
Multiple crystal forms of N,N '-diacetylchitobiose deacetylase from Pyrococcus furiosusNakamura, Tsutomu; Niiyama, Mayumi; Hashimoto, Wakana; Ida, Kurumi; Abe, Manabu; Morita, Junji; Uegaki, KoichiACTA CRYSTALLOGRAPHICA SECTION F-STRUCTURAL BIOLOGY COMMUNICATIONS 71 657-662 Jun 2015
Direct Detection of a Triplet Vinylnitrene, 1,4-Naphthoquinone-2-ylnitrene, in Solution and Cryogenic MatricesSarkar, Sujan K.; Sawai, Asako; Kanahara, Kousei; Wentrup, Curt; Abe, Manabu; Gudmundsdottir, Anna D.JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 137(12) 4207-4214 Apr 2015
Electron-spin resonance (ESR) characterization of quintet spin-state bis-nitroxide-bearing cyclopentane-1,3-diyl diradicalsOmokawa, Yasuyuki; Hatano, Sayaka; Abe, ManabuJOURNAL OF PHYSICAL ORGANIC CHEMISTRY 28(2) 116-120 Feb 2015
Photolysis of acetophenone derivatives with alpha-cyclopropyl substituentsRanaweera, Ranaweera A. A. Upul; Weragoda, Geethika K.; Bain, John; Watanabe, Shinji; Abe, Manabu; Gudmundsdottir, Anna D.JOURNAL OF PHYSICAL ORGANIC CHEMISTRY 28(2) 137-146 Feb 2015
Oxidation of an allene compound bearing 1,8-dichloroacridene moieties and photolysis of the halogenated allene compound for the generation of triplet carbenesFuku-en, Shin-ichi; Furukawa, Ko; Sasamori, Takahiro; Tokitoh, Norihiro; Abe, Manabu; Yamamoto, YohsukeJOURNAL OF PHYSICAL ORGANIC CHEMISTRY 28(2) 79-87 Feb 2015
Unsaturated alpha-Ketoesters and Phenylglyoxal HydratesOrganocatalyzed Asymmetric Aldol Reactions of Ketones and beta,gamma-Unsaturated alpha-Ketoesters and Phenylglyoxal HydratesKonda, Swapna; Guo, Qun-Sheng; Abe, Manabu; Huang, Huicai; Arman, Hadi; Zhao, John C-GJOURNAL OF ORGANIC CHEMISTRY 80(2) 806-815 Jan 2015
Formation of Isomerized E,Z-Configured 1,3-Dienes in Construction of Macrocyclic Trienes by Diene-Ene RCMTakagi, Ryukichi; Tanaka, Kenji; Yamamoto, Koumei; Hiraga, Yoshikazu; Kojima, Satoshi; Abe, ManabuBULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 88(1) 146-148 Jan 2015
1,8-Disubstituted Xanthylidene-Based Remote Carbenes: Photolytic Generation and Isolation of Low-Coordinate Palladium(II) ComplexSugawara, Shun; Abe, Manabu; Fujiwara, Yoshihisa; Wakioka, Masayuki; Ozawa, Fumiyuki; Yamamoto, YohsukeEUROPEAN JOURNAL OF INORGANIC CHEMISTRY (3) 534-541 Jan 2015
Simultaneous Observation of Triplet and Singlet Cyclopentane-1,3-diyl Diradicals in the Intersystem Crossing ProcessMizuno, Takemi; Abe, Manabu; Ikeda, NoriakiAUSTRALIAN JOURNAL OF CHEMISTRY 68(11) 1700-1706 2015
Oxidation of an allene compound bearing 1,8-dichloroacridene moieties and photolysis of the halogenated allene compound for the generation of triplet carbenesFuku-en, Shin-ichi;Furukawa, Ko;Sasamori, Takahiro;Tokitoh, Norihiro;Abe, Manabu;Yamamoto, YohsukeJOURNAL OF PHYSICAL ORGANIC CHEMISTRY 28(2) 79-87 2015
Formation of Isomerized E,Z-Configured 1,3-Dienes in Construction of Macrocyclic Trienes by Diene-Ene RCMTakagi Ryukichi;Tanaka Kenji;Yamamoto Koumei;Hiraga Yoshikazu;Kojima Satoshi;Abe ManabuBull. Chem. Soc. Jpn. 88(1) 146-148 2015
2014Theoretical Study on Diradical Characters and Nonlinear Optical Properties of 1,3-Diradical CompoundsKishi, Ryohei; Murata, Yusuke; Saito, Michika; Morita, Keisuke; Abe, Manabu; Nakano, MasayoshiJOURNAL OF PHYSICAL CHEMISTRY A 118(45) 10837-10848 Nov 2014
Mode Switching of a Self-Propelled Camphor Disk Sensitive to the Photoisomerization of a Molecular Layer on WaterNakata, Satoshi; Miyaji, Tatsuya; Matsuda, Yui; Yoshii, Miyu; Abe, ManabuLANGMUIR 30(25) 7353-7357 Jul 2014
Time-Resolved IR Spectroscopy of 1,3-Dicyanophenylcyclopentane-1,3-diyl Diradicals: CN Stretching Wavenumber as a Vibrational Signature of Radical CharacterMaeda, Akihiro; Oshita, Takahide; Abe, Manabu; Ishibashi, Taka-akJOURNAL OF PHYSICAL CHEMISTRY B 118(14) 3991-3997 Apr 2014
Scope and Limitation for FeSO4-Mediated Direct Arylation of Heteroarenes with Arylboronic Acids and Its Synthetic ApplicationsKomeyama, Kimihiro; Nagao, Yuya; Abe, Manabu; Takaki, KenBULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 87(2) 301-313 Feb 2014
Time-resolved IR spectroscopy of 1,3-dicyanophenylcyclopentane-1,3-diyl diradicals: CN stretching wavenumber as a vibrational signature of radical character.Maeda Akihiro;Oshita Takahide;Abe Manabu;Ishibashi Taka-Aki
2013
Diradicals
Abe, Manabu
CHEMICAL REVIEWS 113(9) 7011-7088 Sep 2013
Kinetic Stabilization and Reactivity of Single-Bonded Species: Effect of the Alkoxy Group on the Lifetime of Singlet 2,2-Dialkoxy-1,3-diphenyloctahydropentalene-1,3-diyls
Nakagaki, Tomoyuki; Sakai, Tomoko; Mizuta, Tsutomu; Fujiwara, Yoshihisa; Abe, Manabu
CHEMISTRY-A EUROPEAN JOURNAL 19(31) 10395-10404 Jul 2013
Substituent effect on the energy barrier for sigma-bond formation from pi-single-bonded species, singlet 2,2-dialkoxycyclopentane-1,3-diyls
Ye, Jianhuai; Fujiwara, Yoshihisa; Abe, Manabu
BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY 9 925-933 May 2013
Substituent Effect on Reactivity of Triplet Excited State of 2,3-Diazabicyclo[2.2.1]hept-2-enes, DBH Derivatives: alpha C-N Bond Cleavage versus beta C-C Bond Cleavage
Abe, Manabu; Watanabe, Shinji; Tamura, Hiroshi; Boinapally, Srikanth; Kanahara, Kousei; Fujiwara, Yoshihisa
JOURNAL OF ORGANIC CHEMISTRY 78(5) 1940-1948 Mar 2013
A novel non-metathetic behavior of Grubbs catalyst: Ruthenium-mediated intramolecular [3+2] cycloaddition of bis-1,3-dienes
Takagi, Ryukichi; Yamamoto, Koumei; Hiraga, Yoshikazu; Kojima, Satoshi; Abe, Manabu
JOURNAL OF ORGANOMETALLIC CHEMISTRY 72(3) 171-175 Jan 2013
On the decarboxylation of 2-methyl-1-tetralone-2-carboxylic acid - oxidation of the enol intermediate by triplet oxygen
Riahi, Abdelkhalek; Muzart, Jacques; Abe, Manabu; Hoffmann, Norbert
NEW JOURNAL OF CHEMISTRY 37(8) 2245-2249 2013
2012
Stretch Effects Induced by Molecular Strain on Weakening sigma-Bonds: Molecular Design of Long-Lived Diradicals (Biradicals)
Abe, Manabu; Furunaga, Haruka; Ma, Dongxia; Gagliardi, Laura; Bodwell, Graham J.
JOURNAL OF ORGANIC CHEMISTRY 77(17) 7612-7619 Sep 2012
Direct observation of denitrogenation process of 2,3-diazabicyclo[2.2.1]hept-2-ene (DBH) derivatives, using a visible 5-fs pulse laser
Abe, Manabu; Iwakura, Izumi; Yabushita, Atushi; Yagi, Shingo; Liu, Jun; Okamura, Kotaro; Kobayashi, Takayoshi
CHEMICAL PHYSICS LETTERS 527 79-83 Feb 2012
The chemistry of localized singlet 1,3-diradicals (biradicals): from putative intermediates to persistent species and unusual molecules with a pi-single bonded character
Abe, Manabu; Ye, Jianhuai; Mishima, Megumi
CHEMICAL SOCIETY REVIEWS 41(10) 3808-3820 2012
2011
Stereochemical deuterium-labeling study on the denitrogenation of 7,7-diethoxy-2,3-diazabicyclo[2.2.1]hept-2-ene
Yagi, Shingo; Hiraga, Yoshikazu; Takagi, Ryukichi; Abe, Manabu
JOURNAL OF PHYSICAL ORGANIC CHEMISTRY 24(10) 894-901 Oct 2011
Concentration and Temperature Dependency of Regio- and Stereoselectivity in a Photochemical [2+2] Cycloaddition Reaction (the Paterno Buchi Reaction): Origin of the Hydroxy-Group Directivity
Yabuno, Youhei; Hiraga, Yoshikazu; Takagi, Ryukichi; Abe, Manabu
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 133(8) 2592-2604 Mar 2011
The cooperative effect of a hydroxyl and carboxyl group on the catalytic ability of novel beta-homoproline derivatives on direct asymmetric aldol reactions
Hiraga, Yoshikazu; Widianti, Triana; Kunishi, Tsuyoki; Abe, Manabu
TETRAHEDRON-ASYMMETRY 22(2) 226-237 Jan 2011
Formation of macrocyclic lactones in the Paternò-Büchi dimerization reaction.
Arimura Junya;Mizuta Tsutomu;Hiraga Yoshikazu;Abe Manabu
BULLETIN JOURNAL OF ORGANIC CHEMISTRY 7 265-269 2011
2010
Computational study on the cyclopropanation reaction of ylides generated from alpha-pyridiniumacetates
Matsumura, Shuji; Takagi, Ryukichi; Kojima, Satoshi; Ohkata, Katsuo; Abe, Manabu
HETEROCYCLES 81(11) 2479-2495 Nov 2010
Novel cyclic beta-aminophosphonate derivatives as efficient organocatalysts for the asymmetric Michael addition reactions of ketones to nitrostyrenes
Widianti, Triana; Hiraga, Yoshikazu; Kojima, Satoshi; Abe, Manabu
TETRAHEDRON-ASYMMETRY 21(15) 1861-1868 Aug 2010
Computational study of the cooperative effects of nitrogen and silicon atoms on the singlet-triplet energy spacing in 1,3-diradicals and the reactivity of their singlet states
Nakamura, Takeshi; Gagliardi, Laura; Abe, Manabu
JOURNAL OF PHYSICAL ORGANIC CHEMISTRY 23(4) 300-307 Apr 2010
Generation and Intermolecular Trapping of 1,2-Diaza-4-silacyclopentane-3,5-diyls in the Denitrogenation of 2,3,5,6-Tetraaza-7-silabicyclo[2.2.1]hept-2-ene: An Experimental and Computational Study
Nakamura, Takeshi; Takegami, Akinobu; Abe, Manabu
JOURNAL OF ORGANIC CHEMISTRY 75(6) 1956-1960 Mar 2010
Stereoselective Triplet-Sensitised Radical Reactions of Furanone Derivatives
Jahjah, Rabih; Gassama, Abdoulaye; Bulach, Veronique; Suzuki, Chikako; Abe, Manabu; Hoffmann, Norbert; Martinez, Agathe; Nuzillard, Jean-Marc
CHEMISTRY-A EUROPEAN JOURNAL 16(11) 3341-3354 2010
Notable Substituent Effects on the Rate Constant of Thermal Denitrogenation of Cyclic Azoalkanes: Strong Evidence for a Stepwise Denitrogenation Mechanism
Ishihara, Chizuko; Abe, Manabu
AUSTRALIAN JOURNAL OF CHEMISTRY 63(12) 1615-1618 2010
2009
Stereoselective Wittig Reactions Using Pentacoordinated Phosphous Reagents
Arimura Junya;Kojima Satoshi;Abe Manabu
Abstracts of Symposium on Physical Organic Chemistry 2009(0) 267-267 2009
Substituent Effect at C2 position on the reactivity of singlet 1,3-diradicals
Nakagaki Tomoyuki;Sakai Tomoko;Fujiwara Yoshihisa;Abe Manabu
Abstracts of Symposium on Physical Organic Chemistry 2009(0) 277-277 2009
2008Recent progress regarding regio-, site-, and stereoselective formation of oxetanes in Paterno-Buchi reactions.Journal of the Chinese Chemical Society (Taipei, Taiwan) 55(3) 479-486 Sep 2008
Site- and stereoselectivity in the photochemical oxetane formation reaction (Paterno-Buchi reaction) of tetrahydrobenzofuranols with benzophenone: Hydroxy-directed diastereoselectivity?Yabuno, Youhei; Hiraga, Yoshikazu; Abe, ManabuCHEMISTRY LETTERS 37(8) 822-823 Aug 2008
Oxidation of archaeal peroxiredoxin involves a hypervalent sulfur intermediate.Proceedings of the National Academy of Sciences of the United States of America 105(17) 6238-6242 Apr 2008
2007
Notable effect of an electron-withdrawing group at C3 on the selective formation of alkylidenecyclobutanes in the thermal denitrogenation of 4-spirocyclopropane-1-pyrazolines. Nonstatistical dynamics effects in the denitrogenation reactions
Hamaguchi, Masashi; Nakaishi, Masahiro; Nagai, Toshikazu; Nakamura, Takeshi; Abe, Manabu
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY 129(43) 12981-12988 Oct 2007
Exo-selective formation of bicyclic oxetanes in the photocycloaddition reaction of carbonyl compounds with vinylene carbonate: The important role of intermediary triplet diradicals in the stereoselectivity
Arkivoc (8) 58-65 Sep 2007
First Direct Detection of 2,3-Dimethyl-2,3-diphenylcyclopropanone.
Journal of Organic Chemistry 72(8) 2777-2784 Apr 2007
New development of reactive intermediate chemistry: a case study of singlet biradicals
Yuki Gosei Kagaku Kyokaishi 65(1) 16-22 Jan 2007
2006
An extremely long-lived singlet 4,4-dimethoxy-3,5-diphenylpyrazolidine-3,5-diyl derivative: a notable nitrogen-atom effect on intra- and intermolecular reactivity.
Angewandte Chemie, International Edition 45(46) 7828-7831 Oct 2006
Experimental Probe for Hyperconjugative Resonance Contribution in Stabilizing the Singlet State of 2,2-Dialkoxy-1,3-diyls: Regioselective 1,2-Oxygen Migration.
Journal of the American Chemical Society 128(24) 8008-8014 Jun 2006
A Matrix Isolation Study of 2-Isopropylidenecyclopentane-1,3-diyl (Berson-Type Diradical).
Journal of Organic Chemistry 71(17) 6607-6610 Apr 2006
Notable temperature effect on the stereoselectivity in the photochemical [2+2] cycloaddition reaction (Paterno-Buechi reaction) of 2,3-dihydrofuran-3-ol derivatives with benzophenone.
Tetrahedron Letters 47(15) 2527-2530 Mar 2006
2005
Alternative protocol for oxidation in water: an effective epoxidation system promoted by the combination of Oxone and an amphiphilic ketone.
Tetrahedron Letters 46(2) 213-216 Jan 2005
Novel Substituent Effects on the Mechanism of the Thermal Denitrogenation of 2,3-Diazabicyclo[2.2.1]hept-2-ene Derivatives, Stepwise versus Concerted.
Journal of the American Chemical Society 127(1) 10-11 Jan 2005
2004
Selectivity Control in Electron Spin Inversion Processes: Regio- and Stereochemistry of Paterno-Buechi Photocycloadditions as a Powerful Tool for Mapping Intersystem Crossing Processes.
Accounts of Chemical Research 37(12) 919-928 Dec 2004
Theoretical Calculations of the Effects of 2-Heavier Group 14 Element and Substituents on the Singlet-Triplet Energy Gap in Cyclopentane-1,3-diyls and Computational Prediction of the Reactivity of Singlet 2-Silacyclopentane-1,3-diyls.
Journal of Organic Chemistry 69(21) 7250-7255 May 2004
2-Silyl Group Effect on the Reactivity of Cyclopentane-1,3-diyls. Intramolecular Ring-Closure versus Silyl Migration.
Journal of Organic Chemistry 69(17) 5622-5626 Apr 2004
Mechanism of Stereo- and Regioselectivity in the Paterno-Buechi Reaction of Furan Derivatives with Aromatic Carbonyl Compounds: Importance of the Conformational Distribution in the Intermediary Triplet 1,4-Diradicals.
Journal of the American Chemical Society 126(9) 2838-2846 Mar 2004
Effects of Spiroconjugation on the Calculated Singlet-Triplet Energy Gap in 2,2-Dialkoxycyclopentane-1,3-diyls and on the Experimental Electronic Absorption Spectra of Singlet 1,3-Diphenyl Derivatives. Assignment of the Lowest-Energy ElectronicTransition
Journal of the American Chemical Society 126(2) 574-582 Jan 2004
2003
DFT Calculations on the Effects of Para Substituents on the Energy Differences between Singlet and Triplet States of 2,2-Difluoro-1,3-diphenylcyclopentane-1,3-diyls.
Journal of the American Chemical Society 125(42) 12823-12828 Oct 2003
Synthesis of Antimalarial Yingzhaosu A Analogues by the Peroxidation of Dienes with Co(II)/O2/Et3SiH.
Journal of Organic Chemistry 68(19) 7361-7367 May 2003
DFT Prediction of Ground-State Spin Multiplicity of Cyclobutane-1,3-diyls: Notable Effects of Two Sets of Through-Bond Interactions.
Journal of Organic Chemistry 68(4) 1618-1621 Feb 2003
Mechanism of an Alcohol-Trapping Reaction in the Direct and Benzophenone-Sensitized Photodenitrogenation of a Spiroepoxy-Substituted Azoalkane: Solvent Effects and Stereochemical Deuterium Labeling.
Journal of Organic Chemistry 68(5) 1796-1803 Feb 2003
2002
Reaction of 7,7-diphenyl-6-oxabicyclo[3.2.0]hept-1-ene with ROH; controlling factors on the regioselectivity in the nucleophilic addition reaction.
Tetrahedron 58(35) 7043-7047 Sep 2002
On the Electronic Character of Localized Singlet 2,2-Dimethoxycyclopentane-1,3-diyl Diradicals: Substituent Effects on the Lifetime.
Journal of the American Chemical Society 124(23) 6540-6541 Jun 2002
Multifunctional anti-angiogenic activity of the cyclic peroxide ANO-2 with antitumor activity.
International Journal of Cancer 100(2) 220-227 Feb 2002
Ozonolyses of 1-alkyl-substituted 1-tert-butylethylenes and highly methylated methylenecycloalkanes. The influence of the substituent steric bulk on the direction of cleavage of the primary ozonides.
Tetrahedron 58(5) 891-896 Feb 2002
2001
Paterno-Buchi [2+2] photocycloaddition reactions of silyl ketene acetals: Controlling factors on the regio- and stereoselectivity in the oxetane formations.
Yuki Gosei Kagaku Kyokaishi 59(9) 855-865 Sep 2001
Regioselective formation of 3-selanyl-3-siloxyoxetanes in the Paterno-Buchi reaction of silyl O,Se-ketene acetals (O,Se-SKA).
Synthesis (8) 1243-1247 Aug 2001
Regioselective Oxygenations of S-Trans Dienes, Silyl Dienol Ethers (SDEs), by Triphenyl Phosphite Ozonide (TPPO) and Its Mechanistic Study.
Journal of Organic Chemistry 66(10) 3548-3553 Mar 2001
New development of localized 1,3-biradicals. Oxygen atom effects on most stable spin multiplicity and reactivity.
Kagaku to Kogyo 54(2) 164-167 Feb 2001
2000
Stereochemical Deuterium Labeling as Mechanistic Probe for Differentiating the Singlet- and Triplet-Diradical Spin States in the Rearrangement of the 2-Spiroepoxy-1,3-cyclopentanediyl to Oxetanes.
Journal of the American Chemical Society 122(27) 6508-6509 Jul 2000
Paterno-Buechi Photocyclization of 2-Siloxyfurans and Carbonyl Compounds. Notable Substituent and Carbonyl (Aldehyde vs Ketone and Singlet- vs Triplet-Excited State) Effects on the Regioselectivity (Double-Bond Selection) in the Formation of Bicyclic exo-
Journal of Organic Chemistry 65(11) 3426-3431 Apr 2000
Notable Sulfur Atom Effects on the Regio- and Stereoselective Formation of Oxetanes in Paterno-Buechi Photocycloaddition of Aromatic Aldehydes with Silyl O,S-Ketene Acetals.
Journal of the American Chemical Society 122(17) 4005-4010 Apr 2000
Lewis acid promoted ring-opening reactions of 2-methoxy-2-siloxyoxetane in the presence of allylsilane: notable lewis acid effect on the ring-opening regioselectivity of the oxetane.
Main Group Metal Chemistry 23(11) 651-654 Mar 2000
Intramolecular and Intermolecular Reactivity of Localized Singlet Diradicals: The Exceedingly Long-Lived 2,2-Diethoxy-1,3-diphenylcyclopentane-1,3-diyl.
Journal of the American Chemical Society 122(9) 2019-2026 Mar 2000
Memory of chirality in photochemical reactions.
Kokagaku 31(1) 28-29 Jan 2000
1999
18O-Tracer Studies of Fe(II)-Induced Decomposition of 1,2,4-Trioxolanes (Ozonides) Derived from Cyclopentenes and Indenes. Inner-Sphere Electron Transfer Reduction of the Peroxide Linkage.
Journal of the American Chemical Society 121(28) 6556-6562 Oct 1999
Photooxygenation (Electron transfer) of silyl enol ethers derived from 1-indanone: silyl group and medium effects on the competitive formation of 3-siloxy-1,2-dioxetane and ? -peroxy ketone.
Main Group Metal Chemistry 22(9) 539-543 Sep 1999
Photooxygenation (1O2) of silyl enol ethers derived from indan-1-ones: competitive formation of tricyclic 3-siloxy-1,2-dioxetane and ? -silylperoxy ketone.
Journal of the Chemical Society, Perkin Transactions 1 (17) 2507-2512 Aug 1999
Donor-Acceptor Binary Photocatalysis System Illustrated by the Intramolecular Cyclization of a Cyclopropanone Acetal Tethered to Cyclohexen-2-one.
Bulletin of the Chemical Society of Japan 72(3) 511-517 Mar 1999
1998
Photochemical Generation and Methanol Trapping of Localized 1,3 and 1,4 Singlet Diradicals Derived from a Spiroepoxy-Substituted Cyclopentane-1,3-diyl.
Journal of the American Chemical Society 120(44) 11304-11310 Dec 1998
A stereoselective, tandem [2+2] photocycloaddition-hydrolysis route to aldol-type adducts.
Journal of the Chemical Society, Perkin Transactions 1 (19) 3261-3266 Sep 1998
Regioselective formation of 2-alkoxyoxetanes in the photoreaction of aromatic carbonyl compounds with β,β -dimethyl ketene silyl acetals: notable solvent and silyl group effects.
Journal of the Chemical Society, Perkin Transactions 1 (19) 3253-3260 Sep 1998
Electronic substituent effects on the EPR-spectral D parameter of trimethylenemethane (TMM) triplet diradicals compared with localized cyclopentane-1,3-diyls.
Journal of the Chemical Society, Perkin Transactions 2 (5) 1063-1068 May 1998
1997
Notable Substituent Electronic Effects on the Regioselectivity of an Oxygen-Atom Abstraction in the Reaction of Unsymmetrically Substituted Monocyclic 1,2-Dioxolanes with Triphenylphosphine.
Journal of Organic Chemistry 62(3) 752-754 Feb 1997
1996
Photoinduced electron transfer reactions of cyclopropanone acetal with conjugated enones in the presence of a redox-type photosensitizer.
Tetrahedron Letters 37(11) 1833-1836 Nov 1996
Selectivity in the ring-expansion and ring-switching reactions of bicyclooxonium ions.
Journal of the Chemical Society, Perkin Transactions 1 (5) 413-416 May 1996
1995
Oxidative Ring-Opening Reaction of Cyclopropanone Acetals with Carbonyl Compounds via Photoinduced Electron Transfer. Generation of a ? -Carbonyl Radical Species and Its Application to the Synthesis of ? -Hydroxy Ester Derivatives.
Journal of Organic Chemistry 60(10) 3065-3073 Mar 1995
1994
Electron Transfer Profile of Cyclopropanone Acetals in the Nonirradiated Reaction with Tetracyanoethylene, Chloranil, and Dicyanodichlorobenzoquinone.
Journal of Organic Chemistry 59(24) 7445-7452 Dec 1994
Formation of unsaturated esters in the single electron transfer reaction of cyclopropanone acetals with quinones under non-irradiation conditions.
Tetrahedron Letters 35(21) 3551-3554 Nov 1994
Photoinduced electron transfer reaction of cyclpropanone acetals with arylmethyl methanesulfonate: generation of β-keto radical species and application to C-C bond formation.
Journal of the Chemical Society, Chemical Communications (14) 1673-1674 Jul 1994
1992
Ring-opening addition reaction of cyclopropanol derivatives with carbenes.
Tetrahedron Letters 33(47) 7169-7172 Dec 1992
Bis(2-acetoxyacrylonitrile) and its phenylene and alkylene bis homologs. Preparation, isomerization, and intramolecular [2 + 2] photocycloaddition.
Journal of Organic Chemistry 57(8) 2263-2266 Apr 1992
,