The invention discloses a method for preparing 1,1,1,3,3-pentachlorobutane. According to the method,
carbon tetrachloride and 2-chloropropene have a
telomerization reaction through a
telomerization catalyst to prepare 1,1,1,3,3-pentachlorobutane, wherein the
reaction temperature ranges from 25 DEG C to 100 DEG C, and the reaction time ranges from 0.5 h to 5 h. The
telomerization catalyst is prepared from a main catalyst, an auxiliary catalyst and an organic
active agent, wherein halogenated
copper salt or halogenated iron salt serves as the main catalyst,
alkyl phosphate or diisopropyl
phosphate or organic
tertiary amine serves as the auxiliary catalyst, azodiisobutyronitrile, 2,2-azobis(4-methoxy-2,4-dimethylvaleronitrile), 1,1-azo-Biscyclohexanecarbonitrile,
ascorbic acid, 2,3,4,5,6-5-hydroxy
aldehyde,
phenylhydrazine or metoxyphenol serves as the organic
active agent, and the
molar ratio of the main catalyst to the auxiliary catalyst to the organic
active agent is 1:(0.5-20):(0.1-20). The telomerization catalyst has the advantages of being mild in
reaction conditions and stable in air and can be used for catalyzing the telomerization reaction between
carbon tetrachloride and 2-chloropropene to prepare 1,1,1,3,3-pentachlorobutane.