Beiträge zum Studium einiger Heterocyclen. L—Massenspektrometrische Untersuchungen von 2-Aryl-4-r-5-acetylthiazolen

The mass spectra of some 5-acetyl thiazoles were studied, and the differences emphasized between them and the corresponding 4-acetyl derivatives. This could constitute a method for their identification. The nature of the substituent in position 4 of the thiazole influences the fragmentation patterns of thiazole ring. In the case of 4-hydroxymethyl derivatives, a skeletal rearrangement occurs before fragmentation.