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A starting material which was a mixture of 3,3',5,5'-tetra-t-butyl-4,4'-diphenoquinone (1.0 g) and 2,6-di-t-butylphenol (1.0 g) was subjected to reaction at 180° C. for 1 hour in a nigrogen gas atmosphere using 10 ml of phenol as a solvent. Thereafter, 0.03 g of sulfuric acid was added to the reaction solution as a catalyst and the reaction was continued for an additional 1 hour at 180° C. in a nitrogen gas atmosphere. As a result, p,p'-biphenol was obtained in an amount of 0.56 g (yield, 62.5%).

1. customwas subjected to reaction at 180° C. for 1 hour in a nigrogen gas atmosphere