Mass spectra of 2,4,5-triphenyl-3H-pyrrol-3-one 1-oxide and derived heterocycles heavily substituted with phenyl groups

High resolution mass spectra are described for the title compound and the isomeric oxazinone, for 1- and 3-hydroxy-2,4,5-triphenylpyrrole, for the oxime, semicarbazone, and 2,4-dinitrophenylhydrazone of 5-benzoyl-3,4-diphenylisoxazole, for 2,5,6-triphenyl- and 2,3,5,6-tetraphenyl-pyrimidone, for 2-benzoyltriphenyl-4-pyridone, and for 3,4-bismethoxycarbonyl-2,5,6-triphenylpyridine. For most of these molecules detailed fragmentation paths are proposed.