The vinylogous anomeric effect in 3-alkyl-2-chlorocyclohexanone oximes and oxime ethers
作者:Scott E. Denmark、Michael S. Dappen、Nancy L. Sear、Robert T. Jacobs
DOI:10.1021/ja00165a034
日期:1990.4
(methyl, ethyl, isopropyl, and tert-butyl), have been prepared and shown to exist predominantly in the diequatorial chair conformation except the tert-butyl derivative which prefers a twist-boat. Formation of the oximes and various oxime derivatives (methyloxime, silyloxime) results in a remarkable conformational inversion for the methyl, ethyl, and isopropyl systems. By analysis of vicinal interproton
已经制备了一系列反式-3-烷基-2-氯环己酮(甲基、乙基、异丙基和叔丁基),并表明它们主要存在于双赤道椅构象中,但叔丁基衍生物倾向于扭曲-船。肟和各种肟衍生物(甲基肟、甲硅烷基肟)的形成导致甲基、乙基和异丙基系统显着的构象反转。通过分析邻位质子间耦合常数,相信这些化合物主要以双轴椅构象存在