Réactions induites par les halogénures de pyridinium. XXIV. Sur la synthése de dibenzofurannes à partir de diméthoxy-2,2′ biphényles |
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Authors: | Jean-Pierre Bachelet Pierre Demerseman Ren Royer |
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Institution: | Jean-Pierre Bachelet,Pierre Demerseman,René Royer |
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Abstract: | Dibenzofurans were obtained by the cyelization of 2,2′-dihydroxybiaryls using pyridinium bromide. The 2,2′-dihydroxy-biaryls were obtained by demethylation via pyridinium chloride from 2,2′-dimethoxybiaryls. The dealkylation which is followed by cyelization into the dibenzofurans with pyridinium bromide is complicated by indirect transmethylation. Acyl derivatives of 2,2′-dimethoxybiaryles lose their acyl group when dealkylated by pyridinium halides, whether or not cyelization follows this process. |
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