摘要
众所周知,三苯基型稳定季鏻盐的 Wittig反应具有 Z-式选择性,其 PTC-Wittig 反应亦具有 Z-式选择性,三苯基型半稳定季鏻盐的 Wittig 反应的立体选择性较差,其产物的Z/E 约为1∶1～1∶1.5。我们曾报道二苯基烯丙基型半稳定季鏻盐与芳醛的 PTC-Wit-
PTC-Wittig reactions of diphenyl diethyl phosphonium salt and diphenyl dibenzylphosphonium salt with para-substituted aromatic aldehydes were studied.Experimental resu-lts showed that the resulting products were mainly of the E-type.The E-selectivity wasaffected apparently by sterie effect of the para-substituents of aromatic aldehydes and pola-rity of the solvents.A possible mechanism was proposed.
出处
《有机化学》
SCIE
CAS
CSCD
北大核心
1991年第1期48-54,共7页
Chinese Journal of Organic Chemistry
基金
国家自然科学基金资助课题
