To effectively enhance the contraposition selectivity of chlorinating reaction the p-chlorotoluene was prepared by direct chlorination of toluene and chlorine gas in the presence of zeolite catalyst.

• 为了有效提高甲苯氯化反应的对位选择性,研究了在分子筛催化作用下甲苯与氯气直接氯化制取对氯甲苯。