专利详情

专利名称	Process for the preparation of 3,3',4,4'-biphenyltetracarboxylic acid and its derivatives
申请号	US19890418059	专利类型	US
公开（公告）号	US5081281	公开（授权）日	1992.01.14
申请（专利权）人	中国科学院长春应用化学研究所	发明（设计）人	DING MENGXIAN (CN); YANG ZHENGHUA (CN); WANG ZUGIANG (CN); ZHANG JING (CN)
主分类号	C07C67/343	IPC主分类号	C07C67/343
专利有效期	Process for the preparation of 3,3',4,4'-biphenyltetracarboxylic acid and its derivatives 至Process for the preparation of 3,3',4,4'-biphenyltetracarboxylic acid and its derivatives	法律状态
说明书摘要	Biphenyl tetracarboxlic acid esters and derivatives thereof are prepared by the coupling reaction of 4-halogen substituted o-benzenedicarboxylic acid ester, carried out in an aprotic polar solvent in the presence of a pre-prepared triphenylphosphine-nickel chloride or trialkylphosphine-nickel chloride catalyst, zinc powder as the reducing agent, and an alkali metal halide promoting agent. The ester may be hydrolyzed in basic solution to afford the corresponding acid. The acid may be heated or boiled with acetic anhydride to afford the biphenyl dianhydride.