Mass spectral fragmentations of four cyclopentane‐condensed cis‐pyrimidinediones and of six cyclohexane‐condensed cis‐ or trans‐pyrimidinediones were examined using metastable ion analyses and exact mass measurements. The fragmentation patterns of all of these compounds were clearly different and also cis‐ and trans‐fused isomers were easy to distinguish from each other by their mass spectra. In spite of the differences in their mass spectral fragmentations, all compounds formed phenylisocyanates (m/z 119 and 153) and anilines (m/z 93 and m/z 127), the structures of which were verified by collision‐induced dissociation experiments.
ASJC Scopus subject areas
- Molecular Medicine