巻号一覧
31 巻, 12 号
選択された号の論文の56件中51～56を表示しています
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土屋 隆, 指田 春喜, 此下 亜里1983 年 31 巻 12 号 p. 4568-4572
発行日: 1983/12/25
公開日: 2008/03/31
ジャーナル フリーTreatment of the N-aminopyridinium salts (5a-e) prepared from 2-ethynylpyridines (4) with potassium carbonate resulted in an intramolecular cyclization to give the corresponding 3-azaindolizines (6) (pyrazolo [2, 3-a] pyridines), presumably via the ionic intermediates (8) and (9). Similarly, pyrazolo [2, 3-a] quinolines (13a-c), pyrazolo [3, 2-a] isoquinolines (16a-c), and pyrazolo [2, 3-b] isoquinolines (19a-c) were obtained from the corresponding ethynylquinolines (11) or ethynylisoquinolines (14, 17) via the N-amino salts (12, 15, or 18).抄録全体を表示PDF形式でダウンロード (559K) -
寺島 正直, 垣見 宏, 石倉 稔, 鎌田 和之1983 年 31 巻 12 号 p. 4573-4577
発行日: 1983/12/25
公開日: 2008/03/31
ジャーナル フリーDialkyl (3-pyridyl) boranes (2) were synthesized by the iodination of lithium trialkyl (3-pyridyl) borates, prepared from trialkylboranes and 3-lithiopyridine. Although 2 was resistant to quaternization or ate-complex formation, betaines (4b-e) were obtained by the reaction of 2a with cyanide ion and alkylating agents in high yields. Further, protonolysis of 2a with propionic acid gave 3-pyridylboronic acid (5). Proton and carbon-13 nuclear magnetic resonance data for 2a, b and 4b are presented.抄録全体を表示PDF形式でダウンロード (479K) -
角川 曜子, 岩崎 成夫, 奥田 重信1983 年 31 巻 12 号 p. 4578-4581
発行日: 1983/12/25
公開日: 2008/03/31
ジャーナル フリーA convenient method is reported for the epoxidation of alkenes and the Baeyer-Villiger oxidation of a variety of carbonyl compounds using the 1-alkoxycarbonyl-1, 2, 4-triazoles (1a-c)/H2O2 system. The reactivities of the resulting peroxycarbonic acids were compared. O-Trichloroethylperoxycarbonic acid prepared in this way was isolated as a chloroform solution and was characterized spectroscopically.抄録全体を表示PDF形式でダウンロード (385K) -
稲山 誠一, 清水 信子, 西原 祥子, 大坂 哲司, 堀 均, 柴田 徹一, 飯高 洋一, / 大沢 英二, Eiji Osawa1983 年 31 巻 12 号 p. 4582-4585
発行日: 1983/12/25
公開日: 2008/03/31
ジャーナル フリー2α-Chloro-1, 2-dihydro-l-α-santonin (1) with the cyclohexenone A-ring of the ordinary half-chair form and the 2β-chloro isomer (2) with that of the unique half-boat from were found to equilibrate through acid-catalyzed epimerization and thermodynamic conformational change. In this, the former was favored over the latter by a free energy difference of 0.7-1.0 kcal/mol. The crystal structure and the half-chair conformation of the molecule of 1 were confirmed by X-ray diffraction methods. Semi-empirical (MNDO and CNDO) and ab initio molecular orbital calculations of these chloroenone conformers using input parameters obtained from their X-ray analytical data reproduced the observed conformational energy.抄録全体を表示PDF形式でダウンロード (423K) -
吉井 英一, 武田 敬1983 年 31 巻 12 号 p. 4586-4588
発行日: 1983/12/25
公開日: 2008/03/31
ジャーナル フリーA convenient O-triethylsilylation with dimethylketene triethylsilyl methyl acetal (1), which is prepared in excellent yield by catalytic hydrosilylation of methyl metacrylate is reported. Primary alcohols react readily at room temperature. Hindered alcohols are rapidly silylated in the presence of a trace amount of trifluoromethanesulfonic acid. For phenols heating with or without solvent is required.抄録全体を表示PDF形式でダウンロード (350K) -
柳田 一夫, 長野 哲雄, 広部 雅昭1983 年 31 巻 12 号 p. 4589-4592
発行日: 1983/12/25
公開日: 2008/03/31
ジャーナル フリー[Fe (SPh)4]1 (lox) and [Fe (S-p-tol)4]1 (2ox), new oxidized rubredoxin model compounds, were synthesized in solution by the ligand-substitution of [Fe (S2-o-xyl)2]1 (3ox) with 10 eq diaryl disulfide in the presence of 2 eq o-xylene-α, α'-dithiol and were characterized by visible and ESR spectra. This method is useful to prepare unstable Fe (III) tetrathiolate complexes containing simple monodentate ligands.抄録全体を表示PDF形式でダウンロード (378K)