| 摘要 |
A process for producing 2,2',3,3',5,5'-hexamethyl-[1,1'-biphenyl]-4,4'-diol, which process comprises,while setting a pH of a reaction liquid containing an alkaline aqueous solution, a surfactant, a copper catalyst and 2,3,6-trimethylphenol during a reaction in the range of from 8 to 14 and controlling the variation range of the pH of the reaction liquid within ±1,oxidatively coupling the 2,3,6-trimethylphenol with an oxygen-containing gas, anda process for producing a bifunctional phenylene ether oligomer compound having a controlled average molecular weight, comprising carrying out oxidation polymerization under a proper oxygen concentration.
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