A mass-spectroscopic study of the terpenoid coumarins mogoltadone,gummosin, and farnesiferol A

Summary The mass spectra of the terpenoid coumarins mogoltadone (I), gummosin (II), and farnesiferol A (III) and their deuterium analogs (IV–VI) have been studied. It has been shown that the main and auxiliary directions of the decomposition of the molecular ions of the substances are similar to the dissociative ionization of the terpenoid coumarins studied previously. The fragmentation of the ions corresponding to the terpene residues of these compounds permits the determination of the presence of keto and hydroxy groups in the bicyclic terpene system and provides the possibility of distinguishing the stereoisomers (II) and (III) with different orientations of the hydroxy groups and also of determining the presence in the terpene residue of a gem-dimethyl grouping in the vicinal position to the keto or hydroxy group.M. V. Lomonosov Moscow State University. Patrice Lumumba International Friendship University. Moscow Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR, Tashkent. Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 207–212, March–April, 1977.