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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、溴素为原料，用无水三氯化铝作催化剂，1 ，2 -二氯乙烷作溶剂合成新型农药中间体间溴苯甲醛。