The mass spectra of substituted 4-hydroxy-, 4-methyl, 3-acyl- and 2′- and 4′-pyrono(5′,6′:3,4)-coumarins are described. Measurements of ionisation and appearance potentials coupled with 13C labelling have permitted a detailed interpretation of some of the mass spectrometric fragmentations of these compounds.
R. A. W. Johnstone, B. J. Millard, F. M. Dean and A. W. Hill, J. Chem. Soc. C, 1966, 1712 DOI: 10.1039/J39660001712
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