THE COLLISION-INDUCED FRAGMENTATIONS OF DEPROTONATED ALLYL ALCOHOL AND ITS MONOMETHYL DERIVATIVES

Deprotonated allyl alcohol undergoes collision-induced losses of H-2, CH2O and C2H4 with minor hydrogen randomization occurring prior to or during these dissociations. A further fragmentation involves loss of methane: labelling studies (with CH2=CH-CD2O-) suggest that this loss is preceded by the equilibration CH2=CH-CD2O- half arrow right over half arrow left CD2=CH-CH2O-. The methyl homologues of allyl alcohol form isomeric C3H5- ions: the charge reversal spectra of these isomers confirm that CH2=CH-CH2-, CH2=CBAR-Me and HCBAR=CH-Me are separate species, and also suggest that all three of the corresponding positive ions are formed on the charge-reversal time-scale.