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The electron impact mass spectra of some cevine orthoacetates
Author(s) -
Waight Eric S.
Publication year - 1989
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.1210240809
Subject(s) - fragmentation (computing) , mass spectrum , ion , hydrogen atom , electron ionization , polyatomic ion , spectral line , electron , hydrogen , chemistry , ring (chemistry) , physics , group (periodic table) , organic chemistry , nuclear physics , quantum mechanics , computer science , ionization , operating system
The most important fragmentation in the electron impact mass spectra of dihydrocevine orthoacetate and some analogues involves loss of an acetoxyl radical from the molecular ion, and is associated with strain in the orthoacetate group bridging a six‐membered ring. The process is much less important in the less‐strained dihydrocevine isoorthoacetate, which gives the ion m / z 112, characteristic of cevine alkaloids, as the most abundant. A further important difference concerns an ion involving the loss of C(20) and its substituents together with a hydrogen atom from M + ˙, also relatively unimportant in the isoorthoacetate.