Treatment of 4a,5,8,8a-tetrahydro-4a-methoxycarbonyl-1,4-naphthaquinone with acetic anhydride gives the Δ8a,1 enol acetate, which in the presence of sodium acetate yields 1,4-diacetoxy-5,8-dihydro-6-methoxy-carbonylnaphthalene; the 2- and the 5-methyl, and the 2,5-dimethyl homologues behave analogously.
M. U. Akpuaka, R. L. Beddoes, J. M. Bruce, S. Fitzjohn and O. S. Mills, J. Chem. Soc., Chem. Commun., 1982, 686 DOI: 10.1039/C39820000686
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