Electron impact mass spectra of 2-[acyl(alkyl)amino]oxazoles

The mass spectral behaviour of 2-methyl-N-butyl-N-(4-methyloxazol-2-yl)propanamide is characterized by cleavage of the acylamino substituents and the elimination of a hydroxyl radical. An understanding of this elimination has been obtained from the analysis of further 2-[acyl(alkyl)amino]oxazoles and the use of deuterium labelled compounds.