Abstract
AbstractThe 13C NMR spectra of diterpenic derivatives having pimarane, isopimarane and the (13S) rosane skeleton have been recorded. This analysis has shown that the chemical shift of the 19‐CH3 group depends on the position of the tetrasubstituted double bond in these skeletons. The C‐19 methyl group can be used as a probe for distinguishing the isopimarane from the rosane skeleton.
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