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A new pesticide intermediate 3-Bromobenzaldehyde was prepared from benzaldehyde and bromine with anhydrous alchlor as the catalyst in 1,2-dichloroethane solvent. 以苯甲醛、溴素爲原料，用無水三氯化鋁作催化劑，1 ，2 -二氯乙烷作溶劑郃成新型辳葯中間躰間溴苯甲醛。