Effect of remote heteroatom substituents on stereochemistry in 1,2 h migration to divalent carbon. Evidence for “negative” hyperconjugation of carbene lone pair
作者:Hideo Tomioka、Norihiro Hayashi、Noboru Inoue、Yasuji Izawa
DOI:10.1016/s0040-4039(00)98575-7
日期:1985.1
Aryloxymethylchlorocarbene generated by photolysis of the corresponding diazirine afforded α-aryloxy-β-chloroalkene. The thermodynamically less stable Z-products are the major isomers and its content becomes dominant as more electron-withdrawing groups are introduced on phenyl ring.
通过相应的二嗪胺的光解产生的芳氧基甲基氯卡宾得到α-芳氧基-β-氯烯烃。热力学上不稳定的Z产物是主要的异构体,并且随着苯环上引入更多的吸电子基团,其含量占主导地位。