柠康酸酐1. Using citraconic anhydride and hydrazin dihydrochloride as base materials,through three steps 3,6-dichloro-4-pyridazinecarboxylic acid was synthesized. 以柠康酸酐和盐酸联氨为起始原料,经过三步反应制得3,6-二氯哒嗪-4-羧酸。2. The synthesis of 3-chloro-5-methylpyridazine,an important ...