The mass spectra of linear and angular 2′,2′-dimethyl-3′-oxodihydropyranocoumarins and their deuterium analogs have been studied. A basic mass-spectrometric difference between these substances has been found which consists in the greater stability of the fragment (M - CO)+. for the linear isomer than for the angular isomer. A hypothesis has been put forward on the most probable route for the formation of the ion (M - 2CO - H)+ in the mass spectra of the compounds mentioned.
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Zakharov, P.I., Terent'ev, P.B. & Nikonov, G.K. Mass-spectrometric distinction of linear and angular 2,2'-dimethyl-3'-oxo-dihydropyranocoumarins. Chem Nat Compd 13, 551–553 (1977). https://doi.org/10.1007/BF00569587
- Mass Spectrum
- Atomic Mass Unit
- Linear Isomer