dehydrobromination of para-substituted β-phenethyl bromides (3) were determined in alkaline solutions under micellar (kψ) and non-micellar (k0) conditions by using hexadecyltrimethylammonium bromide (1) and di-methyl-(2-hydroxyethyl)octadecylammonium chloride (2) as the micellar surfactants. Large micellar effects (kψ/k0) were observed. Good Hammett relationships were obtained for both kψ and k0 with σp– constants
的脱
溴化氢的速率对-取代的β苯乙基
溴化物(3)在碱性溶液下胶束(测定ķ ψ)和非胶束(ķ 0)通过使用
十六烷基三甲基
溴(1)和二甲基-条件(2-羟乙基)
十八烷基
氯化铵(2)作为胶束表面活性剂。大胶束效果(ķ ψ / ķ 0)观察。得到了良好的哈米特关系两者ķ ψ和ķ 0与σ p -常数。相当大的同位素效应(k H / k D= 8-9)也两个观察ķ ψ和ķ 0。结果表明,与非胶束条件相比,在胶束条件下过渡态更像碳负离子。但是,未检测到起始
溴化物与溶剂
水的H-D交换,这表明消除前会形成碳负离子。