作者:Amar R. Mohite、Ravindra S. Phatake、Pooja Dubey、Mohamed Agbaria、Alexander I. Shames、N. Gabriel Lemcoff、Ofer Reany
DOI:10.1021/acs.joc.0c01431
日期:2020.10.16
conditions expedited by the presence of substoichiometric amounts of thiourea additives is presented. The amount of thiourea added dictates the pathway of the reaction, which may diverge from the desired halogenation reaction toward oxidation of the alcohol, in the absence of thiourea, or toward starting material recovery when excess thiourea is used. Both bromination and chlorination were highly efficient
3-substituted-alpha,beta-dibromoethylbenzene and process for preparing the same
申请人:Mitsubishi Chemical Corporation
公开号:EP0754665A2
公开(公告)日:1997-01-22
A novel 3-substituted α,β-dibromoethylbenzene of formula (I):
wherein X represents a halogen atom or a trihalomethyl group, which is a useful intermediate for pharmaceuticals or agricultural chemicals, is prepared by a simple and high yield process which comprises reacting a 3-substituted α-bromoethylbenzene represented by formula (II):
wherein X is as defined above,
or a 3-substituted ethylbenzene represented by formula (III):
wherein X is as defined above, with bromine in the presence of a quaternary ammonium salt.
一种新型 3-取代α,β-二溴乙基苯,其式为(I):
其中 X 代表卤素原子或三卤甲基,是一种有用的医药或农药中间体,其制备方法简单且收率高,包括将式(II)代表的 3-取代α-溴乙苯与式(I)代表的 3-取代α,β-二溴乙苯反应:
其中 X 如上定义、
或式 (III) 所代表的 3-取代乙基苯:
其中 X 如上定义,在季铵盐存在下与溴反应。