The Regioselectivity of Internal Hydrogen Abstraction by Triplet o-tert-Amylbenzophenone
作者:Peter J. Wagner、Raul Pabon、Bong Ser Park、Ali R. Zand、Donald L. Ward
DOI:10.1021/ja00081a020
日期:1994.1
The title ketone undergoes triplet-state 6-hydrogen abstraction to produce two diastereomeric sets of 1-phenyl-1-indanols: the 2,3,3-trimethyl isomers 2Z and 2E by abstraction of a methylene hydrogen and the 3-methyl 3-ethyl isomers 1Z and 1E by abstraction of a methyl hydrogen. The 2/1 ratio varies only modestly with changes in solvent, temperature, and phase, ranging from 0.7 in hydrocarbons to 1
标题酮经历三重态 6-氢提取以产生两组 1-苯基-1-茚满醇:2,3,3-三甲基异构体 2Z 和 2E,通过提取亚甲基氢和 3-甲基 3-通过提取甲基氢得到乙基异构体1Z和1E。2/1 比率仅随溶剂、温度和相的变化而适度变化,范围从烃中的 0.7 到甲醇中的 1.6、晶体中的 2.4 和二氧化硅中的 3.5。苯中的总量子产率为 0.034,甲醇中为 0.43。在对中间体 1,5-双自由基转化为酮进行校正后,产物比率表明溶液中二级氢与一级氢的提取比率为 1/1.6,固体中的比率≤7/1