the acetonitrile solution (after filtration) gave an oil which was chromatographed over tic plates (silica gel G; benzene-ethyl acetate, 4:1). A band (R¡ 0.65) afforded 13 as an oil which did not crystallize after long standing: yield 30 mg; ir bands (CHCla) 3450 (hydroxyl), 1750 (carbonyl), and 1250 (acetate) cm-1. The nmr spectrum (Table I) indicated that the substance was pure and clearly indicated a vinylic methyl group as shown in the formula of 13.
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