New cyclization products, 4,5-bis(arylthio)-2,3,4, 5-tetrahydro-1-benzothiepins were obtained in good yield by the reaction of 2-butynediol with arenethiols in the presence of zinc iodide. The reaction is assumed to proceed through intramolecular cyclization of a cationic intermediate generated in situ.
在
碘化锌存在下,
2-丁炔二醇与壬
硫醇发生反应,获得了新的环化产物--4,5-双(芳
硫基)-2,3,4,5-四氢-1-
苯并噻吩,收率很高。该反应假定是通过原位生成的阳离子中间体的分子内环化进行的。