Mass spectra of 1-methyl-4-phosphorinanone and 1-methyl-4-piperidone

Abstract

The mass spectral fragmentation of 1-methyl-4-phosphorinanone was found to follow two major pathways, each involving intial cleavage of a C–P bond. In addition, fragments were detected which resulted from transfer of oxygen to phosphorus. The pattern was quite different from that of N-methyl-4-piperidone, the spectrum of which resembled that of N-methylpiperidine, with initial cleavage occurring at the 2,3-bond.