A process for producing a halogen-containing ethylbenzene derivative represented by the general formula: ##STR1## where X is a halogen atom, and Y is a nitrile group, a carboxyl group, a lower alkoxycarbonyl group or an amidocarbonyl group, which comprises reacting a vinyl compound represented by the general formula: CH.sub.2 .dbd.CH--Y (II) where Y is as defined above, with a benzenediazonium salt and halogen ions in a solvent mixture comprising a lower alcohol and/or an ether, and water, under an acidic condition with a mineral acid, in the presence of a monovalent copper compound as a catalyst.
                            一种生产含卤代
乙基苯衍
生物的方法,该衍
生物由通式表示为:##STR1## 其中X是卤素原子,Y是腈基,羧基,较低的烷氧羰基或酰胺氧羰基,包括将通式表示为:CH.sub.2.dbd.CH-Y (II)的
乙烯化合物,其中Y如上所定义,与苯重氮盐和卤离子在低级醇和/或醚以及
水的溶剂混合物中,在矿物酸的酸性条件下,在单价
铜化合物作为催化剂的存在下反应。