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