Rates of solvolysis and of base-catalysed elimination of substituted αα-dimethylphenethyl chlorides
作者:L. F. Blackwell、A. Fischer、J. Vaughan
DOI:10.1039/j29670001084
日期:——
Rates of solvolysis in methanol, and of concurrent solvolysis and sodium methoxide-catalysed elimination in methanol, of substituted αα-dimethylphenethyl chlorides have been measured at 66·5°, and product distributions have been determined in these reactions. For solvolysis, log k1 values correlate with σ° values and ρ=–1·15. The product distribution appears to be constant (∼50% ether, ∼30% conjugated
在66·5°下测定了取代的αα-二甲基苯乙基氯化物在甲醇中的溶剂分解速率,以及在甲醇中同时进行的溶剂分解和甲醇钠催化的消除反应,并确定了这些反应中的产物分布。对于溶剂分解,log k 1值与σ°值相关,并且ρ= –1·15。当取代基变化时,产物分布似乎是恒定的(〜50%的醚,〜30%的共轭烯烃和〜20%的非共轭烯烃)。在消除中,共轭烯烃是主要产物,当引入吸电子取代基时,其比例增加。对于消除为共轭烯烃,ρ= + 1·00,对于消除为非共轭烯烃,ρ= -0·10。这些结果与E不一致2机制具有相当大的E 1特征,即在过渡状态下C–X键裂变比C–H键断裂快得多。