An Improved Synthesis of p-Bis(Phenylgloyoxaloyl)-Benzene

摘要

An improved synthesis of p-bis(phenylglyoxaloyl)benzene (BPG), one of the co-monomers for the high temperature resistant polyphenylquinoxaline system, has been achieved. The method consists of three simple, high yield steps leading to a 70% overall yield of BPG. The starting material, phenylacetylene, is quantitatively converted to its cuprous salt which is then coupled with p-diiodobenzene to give p-bis(phenylethynyl)benzene in 73% yield. The diacetylene is oxidized to BPG in 96% yield using N-bromosuccinimide in dimethylsulfoxide. (Author)