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The mass spectra of some naturally‐occurring 3,4‐dialkoxy furocoumarins and their nor ‐derivatives
Author(s) -
MacLeod J. K.,
Nakayama M.
Publication year - 1972
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.1210060307
Subject(s) - furocoumarins , chemistry , mass spectrum , deuterium , metastability , labelling , stereochemistry , methyl group , spectral line , photochemistry , medicinal chemistry , mass spectrometry , group (periodic table) , organic chemistry , chromatography , physics , biochemistry , quantum mechanics , astronomy
The mass spectral fragmentations of several naturally‐occurring 3,4‐dialkoxy furocoumarins from the Halfordia species and their nor ‐derivatives have been studied using deuterium labelling and metastable analysis. Halfordin (I), isohalfordin (VI) and halkendin (X) show a common major breakdown pathway involving initial loss of a methyl radical from the 3‐methoxy group followed by expulsion of CO, then loss of C 2 H 3 O, the latter fragment containing the methyl group from the 4‐position.