Chromenylation of alkylhydroquinones (and 2-naphthol) can be effected by heating aryloxymagnesium bromides with α-unsaturated acetals in benzene thus providing short and simple syntheses of α- and β-tocopherol and a prenylogue of α-tocotrienol.
J. O. Asgill, L. Crombie and D. A. Whiting, J. Chem. Soc., Chem. Commun., 1978, 59 DOI: 10.1039/C39780000059
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