作者:Joon Seok Oh、Byung Hyun Kim、Young Gyu Kim
DOI:10.1016/j.tetlet.2004.03.101
日期:2004.5
In the Wittig olefination reactions of Garner's aldehyde with certain nonstabilized ylides, the (E)-alkenes could be produced as a major product by simply quenching the reactions with a large excess of MeOH at −78 °C. Even under the salt-free conditions, more than a 10:1 ratio of the (E)- to (Z)-alkene was resulted consistently from the ylides of a linear alkyl chain. Without addition of MeOH, usual
在Garner醛与某些非稳定化烷基化物的Wittig烯烃化反应中,可以通过在-78°C下简单地用大量过量的MeOH淬灭反应来生成(E)-烯烃作为主要产物。即使在无盐条件下,(E)-与(Z)-烯烃的比例也始终超过10:1,这是由直链烷基链的基团始终产生的。不添加MeOH,通常以94:6的比例获得对(Z)-烯烃的选择性。