Abstract
Synthesis of chromans and benzopyrylium salts by acid catalysed disproportiionation of Δ3-chromenes and dehydration of 4-chromanols is reported. The disproportion of Δ3-chromenes involves intermolecular hydride transfer which was found to be non-stereospecific in the case of 3,4-dimethyl-Δ3-chromene. Thus the latter on acid treatment gave a 50:50 mixture of cis- and trans-3,4-dimethylchroman.
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