申请人:Bayer Aktiengesellschaft
公开号:US04331821A1
公开(公告)日:1982-05-25
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reactant containing a hydrogen atom in the .alpha.-position is contacted with a halogen and the reaction mixture is withdrawn such that the amount of monohalogenated alkylbenzene formed is no greater than 33 mol percent in the reaction mixture.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 ##STR1## in which R.sup.7 represents trifluoromethoxy, trifluoromethylthio or 2-perfluoropropyl or also, if R.sup.8 represents chlorine, represents trifluoromethyl and, furthermore, if R.sup.8 and R.sup.9 represent trifluoromethyl, represents hydrogen, R.sup.8 represents hydrogen or also, if R.sup.7 represents trifluoromethyl or trifluoromethoxy, represent chlorine and also, if R.sup.7 represents hydrogen and R.sup.9 represents trifluoromethyl, denotes trifluoromethyl and R.sup.9 represents hydrogen and, if R.sup.7 represents hydrogen and R.sup.8 represents trifluoromethyl, denotes trifluoromethyl.
本发明揭示了一种用于在α-位置上进行烷基苯的单卤代反应的过程,其中包含α-位置上的氢原子的烷基苯反应物与卤素接触,并撤回反应混合物,以使所形成的单卤代烷基苯的量不超过反应混合物中的33摩尔百分比。还揭示了新的单卤代烷基苯的公式为##STR1##其中R.sup.7表示三氟甲氧基,三氟甲基硫或2-全氟丙基,或者如果R.sup.8表示氯,则表示三氟甲基,此外,如果R.sup.8和R.sup.9表示三氟甲基,则表示氢,R.sup.8表示氢或者如果R.sup.7表示三氟甲基或三氟甲氧基,则表示氯,如果R.sup.7表示氢且R.sup.9表示三氟甲基,则表示三氟甲基,R.sup.9表示氢,如果R.sup.7表示氢且R.sup.8表示三氟甲基,则表示三氟甲基。