Mass-spectrometric distinction of linear and angular 2,2'-dimethyl-3'-oxo-dihydropyranocoumarins
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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.
KeywordsMass Spectrum Coumarin Monohydroxy Atomic Mass Unit Linear Isomer
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