Simple methods for oxidation of o-allylphenols to chrom-3-enes

Abstract
The reaction of o-allylphenols (1) with potassium dichromate dissolved in benzene using Adogen 464, a commerical mixture of methyl-trialkyl-(C8–C10)-ammonium chloride, or with 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) in ether affords the corresponding chrom-3-enes (3) in good yields.

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