Study on two novel characteristic rearrangements and degradation patterns of six derivatives of 2-pyrimidinoxal aniline by MSn technology

The mass spectra of six derivatives. of 2-pyrimidinoxal aniline were report ed. The characteristics and operational principles of the ion trap MS were introduced. The fragmentation pathways were studied using the ion trap MSn technology. It has been found that there exist two complex but characterist ic rearrangements and fragmentation patterns for these compounds. The base peaks of all the derivatives were [M-17](+). And they all yielded the peak of [M-17-90](+). In addition, they had the same fragments such as m/z : 246 and so on. HEMS of compound c and the MS of the acetylation product of com pound c proved the fragmentation pathways.