“…The mass spectra of straight-chain aliphatic ketones (289), of acyclic a,ß-unsaturated aldehydes, ketones, and esters (290), of cyclic ß-diketones (291), of ,ß-epoxyketones (292), and of diazoketones (298) have been reported. On the mechanistic side, the loss of H20 from molecular ions of aliphatic ketones (294) and the effect of fluorine substitution on the McLafferty rearrangement of aliphatic ketones (295) have been studied.…”