Reactions of 1-halocyclohexenes and methyl substituted 1-halocyclohexenes with potassium t-butoxide
作者:A.T. Bottini、F.P. Corson、R. Fitzgerald、K.A. Frost
DOI:10.1016/0040-4020(72)88141-9
日期:1972.1
Reactions of 1-halocyclohexenes and 1-halo-4-methylcyclohexenes with potassium t-butoxide (t-BuOK) in dimethyl sulfoxide and tetrahydrofuran have been shown to take place by three competing dehydrohalogenation mechanisms. These are: dehydrohalogenation across the C1C6 bond to give a cyclohexyne; dehydrohalogenation across the C1C6 bond to give a 1,2-cyclohexadiene: and prototropic rearrangement to
1-卤代环己烯和1-卤代-4-甲基环己烯与叔丁醇钾(t-BuOK)在二甲亚砜和四氢呋喃中的反应已通过三种竞争的脱卤化氢机理发生。它们是:工作在C脱卤化氢1 C 6键,得到cyclohexyne; 工作在C脱卤化氢1 C 6键合得到1,2-环己二烯:和质子重排成相应的3-卤代环己烯,然后β-消除成1,3-环己二烯。高度应变的环己炔和1,2-环己二烯中间体与t-BuOK反应生成1-叔丁氧基环己烯,在DMSO中的产率为5–20%,在THF中的产率为60%。与取代反应竞争的是1,2-环己二烯二聚为三环[6.4.0.0 2,7 ] -dodeca - 2,12 -diene,以及1,2-和1的1,2-和1,4-环加成,3-环己二烯。