Organic reactions at high pressure. Wittig reaction of hindered ketones with nonstabilized ylides.
作者:William G. Dauben、James J. Takasugi
DOI:10.1016/s0040-4039(00)96514-6
日期:1987.1
The Wittig reaction between n-butylidenetriphenylphosphorane and a series of cyclohexanones of increasing steric hindrance around the carbonyl group has been studied at 7 kbar and 15 kbar pressure (0.75–1.5 GPa) and at 40 °C. In all cases, except 2,2,6,6-tetramethylcyclohexanone and fenchone, 45-60% yields of olefins were obtained, in contrast to poor to no yields which were obtained under ambient
在7 kbar和15 kbar的压力(0.75–1.5 GPa)和40°C的条件下,研究了正丁基亚乙基三苯基磷烷与一系列围绕羰基的位阻增加的环己酮之间的维蒂希反应。在所有情况下,除了2,2,6,6-四甲基环己酮和Fenchone,均能获得45-60%的烯烃收率,与之相比,在环境条件下收率很低甚至没有。