Abstract
Mass spectra of 6, 8-dicyano-7H-thiazolo[3, 2-a]pyridine derivatives were measured by electron impact ionization mass spectrometry. The substituents on the phenyl groups were H (Compound I), p-CH3(II), p-OCH3(III), p-Cl(IV), p-NO2(V), m-NO2(VI). The deuterated compounds of 2, 7-D2(VII) and 5-ND2(VIII) were also examined. The fragmentation patterns were deduced with the aid of the shifts of the peaks by substituted groups and by deuterated derivatives, and some of them were confirmed by the metastable peaks. The fragmentation patterns were quite different from those of 6, 8-dialkoxycarbonyl derivatives. The temperature dependence of mass spectra was tested, and the increase of fragment ion intensity by chamber temperature was observed in the thiazolo-ring opening fragmentation. But other fragment ions did not change their intensity by chamber temperature.
