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- W2002197905 abstract "Certains dibenzofurannes peuvent ětre obtenus par hétéroeyclisation au moyen du bromure de pyridinium des dihydroxy-2,2′ biaryles formés par déméthylation au moyen du chlorure de pyridinium des diméthoxy-2,2′ biaryles. La desalcoylation suivie d'hétérocyclisation en dibenzofurannes des diméthoxy-2,2′ biaryles par le bromure de pyridinium se complique d'une trans-methylation indireete. Les dérivés acylés des diméthoxy-2,2′ biaryles perdent leur groupe acyle lors de leur désalcoylation, suivie ou non d'hétérocyclisation, par les halogénures de pyridinium. 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." @default.
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- W2002197905 date "1977-12-01" @default.
- W2002197905 modified "2023-09-26" @default.
- W2002197905 title "Réactions induites par les halogénures de pyridinium. XXIV. Sur la synthése de dibenzofurannes à partir de diméthoxy-2,2′ biphényles" @default.
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- W2002197905 doi "https://doi.org/10.1002/jhet.5570140823" @default.
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