solutions of the corresponding hydroquinones (with vastly improved yields) rather than by the literature method: 0. Diels and K. Alder, Chem. Ber., 62, 2337 (1929. Catalytic hydrogenation of 17 (5% Pd C, C2H5OH, 1 Torr) furnished 18 quantitatively. ( 19) The epoxyquinones were separated by high pressure liquid chromatography and given their stereochemical assignments on the basis of their 1H NMR spectra; see K.
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