Identification and biosynthesis of (E,E)-10,12-tetradecadienyl acetate in Spodoptera littoralis female sex pheromone gland
摘要:
A minor component of the sex pheromone gland of the Egyptian cotton leafworm, Spodoptera littoralis, has been identified as (E,E)-10,12-tetradecadienyl acetate. Structural elucidation has been carried out by isobutane-chemical ionization mass spectrometry of the fatty acyl biosynthetic precursor-derived methyl ester. To assign the stereochemistry of the double bonds, the four isomers of both 10,12-tetradecadienyl acetates and methyl 10,12-tetradecadienoates have been synthesized and their gas chromatography retention times and mass spectra have been compared to those of the corresponding natural compounds. Mass-labeling experiments showed that the (E,E)-10,12-tetradecadienoyl moiety is biosynthetically derived from (Z)-11-tetradecenoic acid in the insect pheromone gland. (C) 1997 Elsevier Science Ltd.
Insect Desaturases as Unique Analytical Tools To Unravel the Stereochemical Course of the Reduction of Vicinal Ditosylates with Lithium Aluminum Deuteride