Simple procedures for the transformation of vinyl oxiranes to trans, trans-dienes and regio- and stereocontrolled unsaturated bromohydrins are reported.
据报道,简单的方法可以将乙烯基环氧乙烷转化为反式,反式二烯和区域和立体控制的不饱和溴代醇。
A Convenient Conversion of Terminal Alkenes into Homologous Unsaturated and Doubly Unsaturated Esters
作者:Bill Hawkins、Victoria L. Paddock、Nina Tölle、Samir Z. Zard
DOI:10.1021/ol203387r
日期:2012.2.17
Unsaturated and doubly unsaturated esters have been synthesized in two steps by the application of a radical xanthate transfer process of a simple methylsulfoxide starting material to a range of terminal alkenes. syn-Elimination of the sulfoxide gives alpha,beta-unsaturated esters, which coupled with a xanthate elimination yields alpha,beta,gamma,delta-unsaturated esters.
Photochemistry of .alpha.,.beta.-unsaturated esters. IV. Cyclopropyl conjugation in olefinic esters. Conformational effects on ultraviolet absorption