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Mass spectra of some naturally occurring stictane triterpenoids and their trimethylsilyl derivatives
Author(s) -
Holland Patrick T.,
Wilkins Alistair L.
Publication year - 1979
Publication title -
organic mass spectrometry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.475
H-Index - 121
eISSN - 1096-9888
pISSN - 0030-493X
DOI - 10.1002/oms.1210140311
Subject(s) - triterpenoid , trimethylsilyl , chemistry , mass spectrum , ring (chemistry) , mass spectrometry , stereochemistry , organic chemistry , chromatography
The mass spectra of ten di‐ and tri‐oxygenated stictane triterpenoids and their trimethylsilyl derivatives have been studied in detail. Gas chromatography mass spectrometry of the TMS derivatives on OV‐17 and OV‐101 columns provided useful separations and identifications of mixtures of stictanes triterpenoids in lichen extracts. The major fragmentations involve ring C, but specific cleavages in rings A, B and E are also observed which allow the substitution pattern of the skeleton to be readily determined. The formation of an intense [M – C 5 H 11 ⋅] + ion for 22α‐OTMS stictanes appears specific to their ring E configuration.