Abstract
The mass spectra of some naturally
occurring and synthetic α- and γ-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 β to the A ring.
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