Citation: Zheng Hua TIAN, Shu Mei LIU, Peng LEI, Gang LI. NEW SYNTHETIC METHOD OF 4,4'-OXYBIS (BENZOIC ACID) AND ITS APPLICATION IN POLYESTER[J]. Chinese Chemical Letters, ;1991, 2(2): 119-120. shu

NEW SYNTHETIC METHOD OF 4,4'-OXYBIS (BENZOIC ACID) AND ITS APPLICATION IN POLYESTER

Anshan Institute of Iron & Steel Technology, Anshan 114002

Received Date: 25 September 1990

4, 4'-Oxybis (benzoic acid) (Ⅰ) is an important monomer for making synthetic resin, heat resistant film and liquid crystal fiber, etc. It has been synthesized either by the oxidation of 4, 4'-dimethyl diphenyl ether, or by the electrophilic substitution of diphenyl ether, those substituents introduced into the benzene ring can be further transformed into carboxylic groups. Diphenyl ethers are usually prepared from phenols and halobenzenes through Ullmann resction. Due to the high reaction temerature (usually above 200℃), long time heating and the formation of isomers, it is difficult to obtain pure products in high yields.
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