Oxidation of 4‐alkylpyrocatechols 2 by means of an insect diphenoloxidase (laccase) or K 3 [Fe(CN) 6 ] yields, in the presence of resorcinols 1 (R 2 H), complex mixtures of products from which biphenyltetrols 3 (R 3 H) and dibenzofuranones 5 and 6 were isolated. It is suggested that similar homo‐coupling products are formed from pyrocatechols 2b and 2c in insects during cuticle sclerotization.
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Miessner et al. (1991) studied this question.
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