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.
G. Cardillo, M. Orena, G. Porzi and S. Sandri, J. Chem. Soc., Chem. Commun., 1979, 836 DOI: 10.1039/C39790000836
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