A new synthesis of aryl isothiocyanates: carbon disulfide as a dipolarophile. The reaction of (4,5,6,7-tetrahydro-2H-1,2,3-benzotriazolium-1-yl)arylaminide 1,3-dipoles with carbon disulfide: synthesis, kinetics, mechanism. Azolium 1,3-dipoles
作者:Richard N. Butler、Leonie M. Wallace
DOI:10.1039/b006631l
日期:——
7-tetrahydro-2H-1,2,3-benzotriazole as a leaving group. The kinetics and mechanism of the reaction were investigated. The mechanism involves a polar cycloaddition of the triazolium-aminide to the CS2 generating a partially ring-closed intermediate which fragments to the aryl isothiocyanate. Carbon disulfide is not a kinetic superdipolarophile with (1,2,3-benzotriazolium-1-yl)aminide 1,3-dipoles.
一种新的芳基异硫氰酸酯的合成方法,其中 芳基描述了最终来自芳基肼的氮部分。用环己烷处理(4,5,6,7-四氢-2 H -1,2,3-苯并三唑-1-基)芳酰胺1,3-偶极(衍生自环己烷-1,2-二酮双(芳基hydr))二硫化碳丙酮在环境温度下,得到高收率的异硫氰酸芳基酯和2-芳基-4,5,6,7-四氢-2 H -1,2,3-苯并三唑作为离去基团。研究了反应的动力学和机理。该机理涉及三唑-氨基化物与CS 2的极性环加成,生成部分闭环的中间体,该中间体片段化为异硫氰酸芳基酯。二硫化碳不是具有(1,2,3-苯并三唑-1-基)氨基 1,3-偶极子。