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

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.