排序方式: 共有103条查询结果,搜索用时 734 毫秒
91.
Junzo Nokami Mikio Kawada Rokuro Okawara Sigeru Torii Hideo Tanaka 《Tetrahedron letters》1979,20(12):1045-1046
α-Phenylthiocarboxylic acids were converted to the corresponding aldehydes or acetals with oxidative decarboxylation and desulfurization by electrolysis. 相似文献
92.
Takeshi Endo Eishuke Fujiwara Makoto Okawara 《Journal of polymer science. Part A, Polymer chemistry》1981,19(5):1091-1099
The polymer(Poly A) which contains alloxan moiety was prepared by the oxidation of the copolymer of allyl barbituric acid and vinyl acetate with chromium trioxide. The photoreduction of Poly A by ultraviolet (UV) irradiation was used to isolate the polymer(Poly A·) in which the alloxan radical was present. The properties of this polymer(Poly A·) thus obtained were investigated. Poly A was also reduced by chemical agents to obtain the polymer(Poly D) which had a dialuric acid structure. 相似文献
93.
Quinones can be reduced apparently by water mediated by alloxantin (AT) or alloxan radical(A·) produced photochemically from alloxan monohydrate (A-hydrate). 相似文献
94.
Akira Kudo Takeshi Endo Yoshihiro Tosabayashi Makoto Okawara 《Journal of polymer science. Part A, Polymer chemistry》1979,17(3):789-796
To enhance its solubility in common solvents poly(γ-methyl-L -glutamate) (PMG) was transesterificated with ethylene chlorohydrin, ethylene cyanohydrin, and β,β,β-trichloroethanol, respectively. The aminolyses of the resulting polymers proceeded easily in pendant ester groups to give the corresponding amides in reasonable yields without main chain fission. By these procedures the incorporation of functional groups such as azide, amino acid, and thiol into PMG is successfully performed. 相似文献
95.
Hitomi Uno Takeshi Endo Makoto Okawara 《Journal of polymer science. Part A, Polymer chemistry》1985,23(1):63-67
Cationic polymerization of bicyclo ortho ester, 1-phenyl-4-ethyl-2,6,7-trioxabicyclo[2.2.2]octane, was carried out with Lewis acids and cation sources to obtain the polyether containing ester group in the side chain. It was found that boron trifluoride etherate was the most active initiator in the Lewis acids. Magnesium perchlorate and triphenylcarbenium tetrafluoroborate, which have lower nucleophilic counter ions, initiated effectively the polymerization of bicyclo ortho ester. 相似文献
96.
Okawara T Ehara S Kagotani H Okamoto Y Eto M Harano K Yamasaki T Furukawa M 《The Journal of organic chemistry》1996,61(12):4125-4129
Hydrazinoethanols 1 were reacted with aldehydes 2 and 6 and glutaraldehyde (14) in aqueous solution to give dioxatetraazaperhydroanthracenes 3, 7, 12, and 13 and -perylenes 15 in yields of 19-88 and 42-72%, respectively. Compounds 3, 7, 12, and 15 were deduced by (13)C-NMR spectra to have two C(2) symmetry axes, while compound 12 was shown to have a symmetry axis by X-ray crystallography. The most favorable stereoisomers were consistent with predictions obtained by the semiempirical molecular orbital method AM1. The structure of compound 15 was confirmed by X-ray crystallography. 相似文献
97.
Yasuhiro Tomita Shigeru Kabashima Tadashi Okawara Tetsuo Yamasaki Mitsuru Furukawa 《Journal of heterocyclic chemistry》1990,27(3):707-710
2,4-Disubstituted thiosemicarbazides were allowed to react with α-bromoacetophenone to give the anticipated 2,3-dihydro-6H-1,3,4-thiadiazines, whereas with β-propiophenone and γ-butyrophenone to afford the unexpected 2,3-dihydro-1,3,4-thiadiazole. The reaction mechanism was also discussed. 相似文献
98.
99.
Tadashi Okawara Yoshihiro Tateyama Tetsuo Yamasaki Mitsuru Furukawa 《Journal of heterocyclic chemistry》1988,25(4):1071-1075
The intramolecular cyclization of 1- acylbithiourea 1 gave 1,2,4-triazole 2 and 1,3,4-thiadiazole 3 . The reaction of 1 with p-toluenesulfonyl chloride in the presence of trithylamine afforded 3 . Treatment of 1 with methyl iodide in the absence of any base yielded 2-methylthio-1,3,4-thiadiazole 10 and 2-imino- 1,3,4-thiadiazoline 12 . 相似文献
100.
Junzo Nokami Kotaro Nishiuchi Shoji Wakabayashi Rokuro Okawara 《Tetrahedron letters》1980,21(46):4455-4456
2,4-Dienoate was prepared by pyrolysis of 2-(phenylsulfinyl)enoate. N-Isobutyl-E,E-2,4-decadieneamide (pellitorine) was synthesized from decanoic acid in a satisfactory yield. 相似文献