Nucleophilic substitution reaction of halogen atom in β-chloro-and β-bromo-β-trifluoromethylstyrenes by thiolates was studied. Stereo-and regioselectivity of the reaction with respect to the electronic and sterical properties of substituents in the aromatic ring of starting styrenes was investigated. Regioisomer with geminal trifluoromethyl and alkyl-or arylthio groups was found to be formed predominantly or exclusively. The reaction proceeds stereoselectively in nearly quantitative yields. On this basis, a new convenient stereoselective method for the synthesis of trifluoromethylvinyl sulfides was elaborated.
研究了β-
氯和β-
溴-β-三
氟甲基苯乙烯中的卤素原子与
硫醇的亲核取代反应。研究了反应的立体选择性和区域选择性与起始
苯乙烯芳环上取代基的电子和立体性质的关系。发现该反应主要或只形成带有三
氟甲基和烷基或芳
硫基的区域异构体。该反应以接近定量的收率进行立体选择性反应。在此
基础上,详细阐述了合成三
氟甲基乙烯基硫化物的一种新的简便立体选择性方法。