Unexpected transalkylation on 3-alkyl-2-alkylthio-1,3,4-thiadiazolium-5-thiolates: A computational and experimental mechanistic study
作者:Arturo Espinosa、Rafaela García、Pedro Molina、Alberto Tárraga
DOI:10.1039/b923243e
日期:——
5-Alkylthio-3-methyl-2-thioxo-1,3,4-thiadiazolines have been obtained on heating alkyl 1-methyl-1-hydrazinecarbodithioates with CS2. A DFT-based computational mechanistic study suggests an initial pseudopericyclic [1,4]H shift as a key step, as well as the intermediacy of the otherwise expected isomers 2-alkylthio-3-methyl-1,3,4-thiadiazolium-5-thiolates, from which the final products are formed by
通过用CS 2加热1-甲基-1-肼碳二硫代烷基酯,获得了5-烷硫基-3-甲基-2-硫代氧杂1,3,4-噻二唑啉。基于DFT的计算机理研究表明,初始的伪周环[1,4] H位移是关键步骤,以及其他预期的异构体2-烷硫基-3-甲基-1,3,4-噻二唑-5的中间体-硫醇盐,通过逐步的S,S-烷基转移反应形成最终产物。