o-Chlorotoluene was chlorinated with N-chlorosuccinimide as chlorinating agent,and then hydrolyzed by dripping water under the action of zinc chloride,and the finished product o-chlorobenzaldehyde was prepared by rectification.After screening the conditions of chlorination reaction and hydrolysis reaction,the optimum technological conditions were obtained as follows:in the chlorination reaction,the reaction temperature was 105℃,and n(N-chlorosuccinimide)∶n(benzoyl peroxide)∶n(o-chlorotoluene)= 2.3∶0.05∶1;in the hydrolysis reaction,the reaction temperature was 135～145℃,and n(zinc chloride)∶n(o-chlorobenzyl chloride)=0.05∶1.Under this condition,the yield of the whole reaction could reach 93%,and the purity of finished product could reach 99.5%.
万方数据
维普
