Process for producing 1,3-bis(dicarboxyphenyl)-disiloxane derivative or dianhydride thereof.

摘要

A process for producing a compound of formula [V] or a dianhydride thereof <CHEM> wherein R and R min are the same or different and each is methyl or phenyl comprising coupling a Grignard reagent of halo-o-xylene with a disubstituted halosilane <CHEM> wherein X is halogen, hydroxylating the product silane to form a hydroxysilane dehydrating-condensing the hydroxysilane to form a 1,3-bisdimethylphenyl-disilane derivative oxidizing the 1,3-bis(dimethylphenyl)disilane derivative to yield the intended 1,3-bis(dicarboxyphenyl)disiloxane derivative. The dianhydride is formed by dehydration ring closure of this product and [VI], mixing the resulting isomeric mixture with an ether solvent, and recovering the formed precipitate to yield a white powder of the intended dianhydride.