Abstract
The signals for the pro(R) and pro(S) methyl groups of the isopropyl group, in the 13C{1H} n.m.r. spectrum of 12-O-methylferruginol, have been assigned by the synthesis of the title compounds and the stereochemistry of 1,2-methyl migration for biosynthesis of the abietane skeleton of ferruginol has been established.

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