Abstract
1. The reaction of shielded silicon-containing phenols (2-trimethylsilyl-4,6-di-tert-butylphenol and 2,6-bis(trimethylsilyl)-4-tert-butylphenol) with benzoyl peroxide in benzene at 80° leads to a dehydro-genation of the phenols with the formation of benzoic acid and phenoxyl radicals. The latter dimerize to give the corresponding disiloxybiphenyls. 2. The indicated phenols under the influence of benzoic acid form 2,4-disubstituted phenols, which react with a new molecule of the starting phenol to give the combined oxidation products, namely 2-hydroxy-2′-trimethylsiloxy-3,3′,5,5′-tetrasubstituted biphenyls.
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