process for the production of biphenolen.

摘要

Biphenols are prepd. by oxidative coupling of the corresp. phenol in the presence of diphenoquinone produced as by-prod. in the same reaction, or of a mother liquor from the reaction which contains the diphenoquinone. Pref. the oxidative coupling is carried out using oxygen. Specifically claimed is the conversion of 2,6-di-tert-butylphenol to 3,3',5,5'-tetra-tert -butyl-1,1'-biphenyl-4,4'-diol.