作者:R. Tanaka、M. Rodgers、R. Simonaitis、S.I. Miller
DOI:10.1016/s0040-4020(01)98055-x
日期:1971.1
detectable products, phenylacetylene, phenylmethoxyacetylene (2), (E)-β-bromo-β-methoxy- styrene, and (Z)-β-bromo-α-methoxystyrene lie on discrete mechanistic paths and are not interconvertible under the reaction conditions. Comparable amounts of alkynyl and alkenyl ethers are formed by attack on carbon 1. The element effects for attack on halogen, K(Cl)/k(Br) ⋍ 0·4, and on carbon 1, k(Cl)/L(Br) ⋍ 1·6 are
苯卤代乙炔对甲醇中的甲醇离子是三亲的。在苯氯乙炔(1 ')的作用下,甲醇盐对氯的侵蚀程度约为0·2%,对碳1的侵蚀程度约为99%,对于碳2的侵蚀程度约为1%;与苯基溴乙炔(1)一起,甲醇盐对溴的攻击约为5%,对碳1的干扰为〜83%,对碳2的攻击为约11%。第一种可检测的产物为苯乙炔,苯甲氧基乙炔(2),(E)-β-溴-β -甲氧基-苯乙烯和(Z)-β-溴-α-甲氧基苯乙烯位于不连续的机理路径上,并且在反应条件下不可相互转化。相当数量的炔基和烯基醚是通过碳1的进攻而形成的。元素对卤素,K(Cl)/ k(Br)⋍0·4和对碳1的进攻。k(Cl)/ L(Br)⋍1·6与独立竞争过程的概念一致。苯甲氧基乙炔是短寿命的瞬态。它的形成和衰变(含甲醇盐)的速率常数,在78°弧时k 1'2(Cl)0·6×10 -4 *或k 12(Br)0·5×10 -4和K j 1·7×10 -3 M -1秒-1。以前,