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Benzopyrones—V Mass spectra of some ethyl 4-oxochromen-2-carboxylates and related compounds

✍ Scribed by G. Barker; G. P. Ellis

Publisher: John Wiley and Sons
Year: 1971
Tongue: English
Weight: 401 KB
Volume: 5
Category: Article
ISSN: 1076-5174
DOI: 10.1002/oms.1210050712

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✦ Synopsis

Abstract

The mass spectra of 23 chromone derivatives are recorded and interpreted. Most of these are ethyl 4‐oxochromen‐2‐carboxylate derivatives, which with two exceptions, show the molecular ion as the base peak. In the spectrum of the unsubstituted ester (XVIII), the other most important fragments are [M—C2H4], [M—OEt], [M—C2H4—CO], [M—CO2Et + 1] and the benzocyclopropenyl ion. 6‐Hydroxy‐2‐methylchromone and several of its derivatives undergo a retro‐Diels‐Alder reaction (R.D.A.) and also lose the carbonyl group. Ethyl 6‐amino‐4‐oxochroman‐2‐carboxylate (XXIII) shows an R.D.A. reaction as well as losing the CO2Et group. The mass spectrum of 4‐oxochromen‐2‐carboxylic acid has been studied.

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