Abstract
Laccase from Botrytis cinereacatalyzes benzylic oxidations and cleavage of lignin-related diphenylmethanes. Selective reactions with non-phenolic monomeric or b-1-dimeric model compounds using O 2 and redox mediators can also be carried out. At substrate to mediator ratios of 5:1, 1-hydoxybenzotriazole (HOBT) is 8-20 fold more effective than 2,2-azinobis-3-ethylthiazoline-6-sulfonate (ABTS) for such biotransformations. With unblocked phenols, ring couplings are the dominant endproducts either with or without mediators.
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