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您的检索式：作者名="Toyotoshi Ueda"
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| 1 | EVIDENCE FOR AROMATIC sp^2 C-H…O=C INTRAMOLECULAR INTERACTION IN PYRIDINO AND BENZOBENZANTHRONE SKELETONS显示文摘EVIDENCEFORAROMATICsp~2C-H…O=CINTRAMOLECULARINTERACTIONINPYRIDINOANDBENZOBENZANTHRONESKELETONS￥ZeperABLIZ(DepartmentofChemist?.. | Zeper ABLIZ (Department of Chemistry, Xin Jiang University, Urumchi 830046) Hiroshi MORIYAMA and Junji AOKI (Department of Chemistry, Toho University, Funabashi, Chiba 274, Japan) Toyotoshi UEDA (Department of Chemistry, Meisei University, Hino, Tokyo 19 | 1995 | Chinese Chemical Letters1995，6，5： | 0 |
| 2 | Existence of aromatic sp^2 C-H…O = C intramolecular interaction similar to hydrogen bond显示文摘A ’H NMR signal shifted drastically to down field (δ - 10.0) at the bay area and in dose proximity to C = O group for H-1 was observed through complete assignments of 1H NMR spectra for pyridino- and benzobenzanthrones. It is concluded that this phenomenon is due not only to the anisotropy effect of C=O plus aromatic ring current effect, but also to the electrostatic attraction of C-H (δ+)…O(δ-)=C interaction. The evidence for the sp2C-H…O = C intramolecular interaction similar to hydrogen bond has also been given by EI-MS and MS/MS (CID) spectroscopy and IR spectroscopy, as well as MNDO-PM3 calculations. This new kind of interaction might be called ’quasi-hydrogen bond’. | Zeper Abliz Hiroshi Moriyama Junji Aoki Toyotoshi Ueda | 1996 | Science China Chemistry1996，39，3： | 0 |
| 3 | Discrimination of Structural Isomers of Aromatic Compounds with EI Mass Spectra and Their Ionization Efficiency Curves of Dehydrogenated Fragment Ions显示文摘The mechanism of ionization and fragmentation for terphenyl (diphenylbenzene) withthree structural ring isomers (ortho-, meta- and para-), and stilbene (1,2-diphenylethylene) with two geometrical isomers (trans- and ets-) by EI mass spectrometry and ionizstion efficiency curves are investigation. | Zeper ABLIZ Li Jun LI Teruo KAN and Toyotoshi UEDA(Institute of Materia Medica, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100050Tokyo Metropolitan Research Laboratory of Public Health, Shinjuku-ku, Tokyo 160, JapanDepa | 1998 | Chinese Chemical Letters1998，9，10： | 0 |
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