Process for the monohalogenation of alkylbenzenes in alpha position and alkylbenzenes monohalogenated in alpha position

摘要

A process for the monohalogenation of alkylbenzenes in the alpha -position is disclosed wherein an alkylbenzene reactant containing a hydrogen atom in the alpha -position is contacted with a halogen and the reaction mixture is withdrawn such that the amount of monohalogenated alkylbenzene formed is no greater than 33 mol percent in the reaction mixture. Also disclosed are novel monohalogenated alkylbenzenes of the formula IMAGE in which R7 represents trifluoromethoxy, trifluoromethylthio or 2-perfluoropropyl or also, if R8 represents chlorine, represents trifluoromethyl and, furthermore, if R8 and R9 represent trifluoromethyl, represents hydrogen, R8 represents hydrogen or also, if R7 represents trifluoromethyl or trifluoromethoxy, represent chlorine and also, if R7 represents hydrogen and R9 represents trifluoromethyl, denotes trifluoromethyl and R9 represents hydrogen and, if R7 represents hydrogen and R8 represents trifluoromethyl, denotes trifluoromethyl.