共查询到20条相似文献,搜索用时 15 毫秒
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The corresponding 1-(2-quinoxalyl)-, 1-[3,5-di(trifluoromethyl)phenyl]-, and 1-ethoxycarbonyl-3-methyl-4-oxo-4,5,6,7-tetrahydroindazoles have been obtained from reactions of 2-acetyl-1,3-cyclohexanedione, its 5,5-dimethyl and 5-(2-furyl) derivatives, with 2-hydrazinoquinoxaline, 3,5-di(trifluoromethyl)phenylhydrazine, and ethoxycarbonylhydrazine. On interaction with ethoxycarbonylhydrazine the intermediate 2-[1-(-ethoxycarbonyl)hydrazino]ethylidene-1,3-cyclohexanediones were also isolated. From the potassium salt of 2-formyldimedone and 2-carboxyphenylhydrazine hydrochloride, 2-(2-carboxyphenyl)hydrazinomethylene-5,5-dimethyl-1,3-cyclohexanedione was obtained, the cyclization of which in ethanol in the presence of HCl led to 1-(2-carboxyphenyl)- and 1-(2-ethoxycarbonylphenyl)-6,6-dimethyl-4-oxo-4,5,6,7-tetrahydroindazole. 相似文献
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《Tetrahedron letters》1986,27(2):171-174
The title compounds are prepared for the first time by reaction of 2,4,6-tri-tert-butyl-benzoylchloride and tris-(trimethylsilyl)-phosphane. 相似文献
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H. Butcher T. A. Hamor I. L. Martin 《Acta Crystallographica. Section C, Structural Chemistry》1983,39(10):1469-1472
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David S. Soriano Kenneth F. Podraza Norman H. Cromwell 《Journal of heterocyclic chemistry》1980,17(7):1389-1392
A number of 1-alkyl-2-carbomethoxy(benzyloxy)-4-methylazetidines have been prepared by reaction of primary amines with α,γ-dibromo esters. Only one isomer was isolated from the reaction mixture. α-Aminolactones can also be obtained as the minor product of the reaction sequence. 相似文献
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Owens FJ 《Journal of computational chemistry》2005,26(8):803-806
The PM3, AM1, and MINDO3 semiemperical methods are used to calculate the the energy difference between C60ON and C60ON- and the bond dissociation energy necessary to cleave neutral and negatively charged (C60)2 dimers and epoxide dimers, (C60)2ON, to their respective monomers C60, and C60ON/2. The results show that the anions of the dimers are significantly more stable than neutral dimers. This result may explain the higher thermal stability of the observed ferromagnetic phase in photolyzed C60. which has been attributed to epoxide dimers and oligomers. It also provides an explanation for the origin of unpaired electron spin necessary for ferromagnetism. 相似文献
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