Diterpenoids. XV. Conformational Studies. III. Temperature Dependent Proton Magnetic Resonance Spectra of Ring C Aromatic Tricyclic Diterpene

Abstract

Temperature dependent proton magnetic resonance studies of four basic ring C aromatic tricyclic diterpenes (I, II, III and IV) are discussed and shown to be able to characterize each stereoisomers. This method is also applied to the analysis of 7-oxo and 20-nor derivatives.