Wittig Reaction: Role of Steric Effects in Explaining the Prevalent Formation of <i>Z</i> Olefin from Nonstabilized Ylides
作者:Graziano Baccolini、Camilla Delpivo、Gabriele Micheletti
DOI:10.1080/10426507.2012.694000
日期:2012.11.1
Abstract For understanding the mechanism involved in the Wittig reaction, it is important to know the factors which influence the stability of 1,2-oxaphosphetane intermediates with pentacoordinate phosphorus; in these intermediates, the steric factor plays a predominant role. Studying the Wittig reaction between nonstabilized ylides and different aldehydes, we noted that the stereochemical outcome
摘要 为了理解Wittig 反应的机理,了解影响1,2-氧杂膦烷与五配位磷中间体稳定性的因素很重要;在这些中间体中,空间因子起主要作用。研究不稳定叶立德和不同醛之间的 Wittig 反应,我们注意到推动 Z-烯烃形成的立体化学结果仅受不同空间因素的影响。所提出的机制与先前报道的机制不同,因为它强调了氧原子位于赤道位置的两个顺式/反式氧杂膦烷中间体的基本作用。图形概要