The S<sub>N</sub>3-S<sub>N</sub>2 spectrum. Rate constants and product selectivities for solvolyses of benzenesulfonyl chlorides in aqueous alcohols
作者:T. William Bentley、Robert O. Jones、Dae Ho Kang、In Sun Koo
DOI:10.1002/poc.1522
日期:2009.9
reported for solvolyses of 4‐Z‐substituted sulfonyl chlorides (Z = OMe, Me, H, Cl and NO2) in 2,2,2‐trifluoroethanol–water. To explain these results and previously published data on kinetic solvent isotope effects (KSIEs) and on other solvolyses of 4‐nitro and 4‐methoxybenzenesulfonyl chloride, a mechanistic spectrum involving a change from third order to second order is proposed. The molecularity of
据报道,在25°C时,苯磺酰氯和4-氯衍生物的溶剂分解反应可在乙醇-水(EW)和甲醇-水(MW)混合物中提供多种二元水性混合物的速率常数和产物选择性(S)。 。使用摩尔浓度将S定义如下:S =([酯产物] / [酸产物])×([水溶剂] / [醇溶剂])。还报告了4 Z取代的磺酰氯溶剂分解的其他选择性数据(Z = OMe,Me,H,Cl和NO 2)在2,2,2-三氟乙醇水溶液中。为了解释这些结果以及以前发表的有关动力学溶剂同位素效应(KSIE)以及4-硝基和4-甲氧基苯磺酰氯的其他溶剂分解的数据,提出了一种从三阶到二阶变化的机理谱。讨论了这些反应的分子性,以及新术语“ S N 3–S N 2光谱”及其与更完善的术语“ S N 2–S N 1光谱”的联系。版权所有©2009 John Wiley&Sons,Ltd.