
%0 Journal Article
%A Barnes, CS 
%A Occolowitz, JL 
%T The mass spectra of some naturally occurring oxygen heterocycles and related compounds
%J Australian Journal of Chemistry
%D 1964/09/01
%V 17
%N 9
%P 975-986
%K 
%R https://doi.org/10.1071/CH9640975
%U https://www.publish.csiro.au/paper/CH9640975 
%X The mass spectra of some naturally occurring and synthetic &#945;- and &#947;-pyrones, benzofurans, and 2,2-dimethylchromenes have been determined. Under electron impact compounds derived from coumarin lose oxygen atoms as CO, usually forming a stable benzofuran ion. 2,2-Dimethylchromenes lose a methyl radical to give a stable benzopyrylium ion, while the most prominent fission of flavanoid compounds occurs by breaking both bonds &#946; to the A ring. 
