Bowie, J. H. published the artcileElectron impact studies. XXIII. Mass spectra of some alkyl and aryl oxazoles, Formula: C5H7NO, the publication is Organic Mass Spectrometry (1968), 1(1), 13-29, database is CAplus.
The mass spectra of a variety of alkyl and aryl oxazoles have been determined and the spectra analyzed with the aid of D labeling and high resolution mass spectrometry. In contrast to the corresponding benzenoid compounds, the mass spectra of isomeric alkyl oxazoles are distinctive and in this respect are akin to those of the corresponding pyridines. Further analogy to the pyridines is suggested by the unfavorable nature of a carbonium ion adjacent to the 2-position and this effect may be used to locate alkyl substituents attached to the oxazole nucleus. The loss of CO from the mol. ions of 2,5-disubstituted oxazoles probably occurs with ring opening and migration of the C-5 substituent (e.g., Br) to the C-4 position. 22 references.
Organic Mass Spectrometry published new progress about 20662-83-3. 20662-83-3 belongs to oxazolidine, auxiliary class Oxazole, name is 4,5-Dimethyloxazole, and the molecular formula is C5H7NO, Formula: C5H7NO.
Referemce:
https://en.wikipedia.org/wiki/Oxazolidine,
Oxazolidine | C3H7NO – PubChem