Extractive compounds of birch buds (Betula pendula Roth.): II. Carbonyl compounds and oxides. Esters

Abstract

This report is devoted to study of the composition of the hydrocarbon extract from buds of European birch (Betula pendula). We have identified norsesquiterpene aldehyde, or birkenal (1S,4S,7R)-4,8,8-trimethyl-2-methylene-bicyclo[5.2.0]-nonan-4-al, β-caryophyllene oxide, fatty acid triglycerides, a triterpene compound, i.e., dammaradienone (3-oxo-dammara-20(21),24-diene), and the following acetates of sesquiterpene alcohols: (6R)-acetoxy-β-caryophyllene ((1R,6R,9S)-acetoxy-4,11,11-trimethyl-8-methylenebicyclo[7,2,0]-undec-4-ene), 14-acetoxy-β-caryophyllene ((1R,9S)-14-acetoxy-4,11,11-trimethyl-8-methylenebicyclo[7,2,0]-undec-4-ene), (6R)-acetoxy-α-humulene ((6R)-acetoxy-4,11,11-trimethyl-8-methylcy-cloundec-1,4,8-triene), αβ and βα oxides of 14-acetoxy-β-caryophyllene (14-acetoxy-4,5-epoxy-4,11,11-trimethyl-8-methylenebicyclo[7,2,0]undec-4-ene). The gas chromatographic retention indices of all identified compounds have been determined.