Synthesis, Chemical Properties, and Structure of a Sterically Hindered Ketone, 2,2,5,5-Tetramethyl-4,4-diphenyl-3-thiolanone
作者:Juzo Nakayama、Atsushi Hirashima、Yoshinobu Yokomori
DOI:10.1246/bcsj.64.3593
日期:1991.12
A sterically hindered ketone, 2,2,5,5-tetramethyl-4,4-diphenyl-3-thiolanone (1), was synthesized in two steps starting from 2,2,4,4-tetramethyl-1,5-diphenyl-3-thiapentane-1,5-dione. The carbonyl group of 1 is unreactive toward a series of nucleophiles which are bulkier than hydride or its equivalents. The observed unreactivity is ascribed to the steric hindrance enhanced by the two methyl groups on
从 2,2,4,4-四甲基-1,5-二苯基开始,分两步合成了空间位阻酮,2,2,5,5-四甲基-4,4-二苯基-3-硫杂环戊烷酮 (1) -3-thiapentane-1,5-dione。1 的羰基对一系列比氢化物或其等价物大的亲核试剂没有反应性。观察到的非反应性归因于 C-5 上的两个甲基增强的空间位阻(“支撑”效应)。还描述了1的X射线单晶结构分析的结果。