Directed Functionalization of the Pimarane Skeleton, I. – Oxidation Reactions
Selective oxidation of dextropimaric acid (2) using different reagents, e.g. H2SeO3, pyridine–SO3, air etc., is described. The structures of the products have been determined by spectroscopic methods. The 1H‐ and 13C‐NMR resonances of all compounds have been assigned.