Preparation of dimethyl-4,4'-dimethoxy-5,6,5 ', 6'-dimethylenedioxy-2,2'-dicarboxylate

摘要

Dimethyl-4,4'-dimethoxy-5,6,5 ', 6'-dimethylenedioxy-2,2'-dicarboxylate can be obtained by esterification reaction of gallic acid or tannic acid, etherification reaction, Followed by a cyclization reaction and a ullmann reaction.;When the bromination reaction is carried out through the bromination reaction before the cyclization reaction and the bromination reaction product is cyclized, the yield of the final product is improved and the side reaction is reduced. Especially, when tannic acid is used as a raw material, gallic acid is used as a raw material Manufacturing cost can be reduced.