Abstract
Of the four possible racemates of α-(3-keto-9-methyl-3, 5, 6, 7, 8, 9-hexahydronaphthyl-6)-propionic acid, three kinds with m. p. 164°, 155°, and 202°, were obtained starting from methyl α-(3-ketocyclohexyl)-propionate or diethyl (3-ketocyclohexyl)-methylmalo nate which were derived through the hydroxymethylene compound to the formyl methyl compound, condensed with acetone, cyclized, and saponified. The lower melting compounds were structurally confirmed by their dienone-phenol rearrangement and from this the difference in their structures at C11 was assumed. On the other hand, the position of the hydroxymethylene was directly confirmed by other methods.
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