Degradation in aqueous solution of O-aryl N-arylthioncarbamates to aryloxide ions and isothiocyanates. A study of Leffler's assumption
作者:Stephen V. Hill、Sergio Thea、Andrew Williams
DOI:10.1039/p29830000437
日期:——
Rate constants for the title reaction have been measured in both forward and reverse directions leading to rates and equilibrium constants for all the steps in equation (i). The effects of varying the structures of Ar Ar–O–CS–NHAr′⇆ Ar–O–CN–Ar′⇆ Ar–O–+ Ar′NCS (i) and Ar′ on the equilibrium and rate constants were measured; identical Leffler–Grunwald indices (α=βF/βEQ= d log k/d log K) for the addition
working very well not only for alkyl and electron-rich aryl isothiocyanates, but also for highly electron-deficient aryl and heterocyclic isothiocyanates. A facile and efficient synthesis of isothiocyanatesfromamines is described. This method involves the reaction of amines with phenyl chlorothionoformate in the presence of solid sodium hydroxide by either a one-pot process or a two-step approach. The
Convenient Synthesis of Unsymmetrical N,N′-disubstituted Thioureas in Water
作者:Zhengyi Li、Yuan Chen、Yue Yin、Zhiming Wang、Xiaoqiang Sun
DOI:10.3184/174751916x14760947474916
日期:2016.11
and convenient two-step method has been developed and used to synthesise 25 (4 of which are novel) unsymmetrical N,N′-disubstituted thioureas in water. Alkylamines or variously substituted arylamines reacted smoothly with phenyl chlorothionoformate at room temperature to form thiocarbamates, which were then reacted with another alkyl- or arylamine in water at reflux to afford the unsymmetrical N,N′-disubstituted