Zur Kenntnis der Triterpene. 191. Mitteilung. Zur Stereochemie des α‐Onocerins

Abstract

Abstract The absolute configuration of α‐onocerin (I) at C‐5, C‐10, C‐5′ and C‐10′ has been established by degradation of onocerin and of abietic acid (XIV) to an identical acid, (−)‐trans‐[2,6,6‐trimethyl‐2‐carboxy‐cyclohexyl‐(1)]‐acetic acid (XIII). As the relative configuration of C‐5 with regard to C‐3 has also been determined, the absolute configuration of C‐3 and C‐3′ too is known.