The fragmentations of tetramethoxysilane ((CH,O),Si (1)) and trimetboxymetbylsilaw ((CH,O),SiCH, (3)) induced by electron impact were investigated by mass-amlysed ion kinetic energy (MIKE) spectrometry and a deuterium-labelling study. These molecular ioas begin to fragment by the loss of CH3 or CH,O. These fmgmentations are followed by the loss of an aldehyde molecule (H,CO), as commonly observed in the mass spectra of alkoxysilanes Almost complete scrambling of the metboxy hydrogens takes place in the metastable molecular ion, 11
Loss of CO from the Molecular Ion of 2,4-PentanedioneZamir et al. ' have proposed the mechanism for loss of CO from the molecular ion of 2,4-pentanedione (acetylacetone), 1, which involves the transfer of one of the two methyl groups to a more remote carbonyl function prior to loss of CO, and the resultant ion is depicted as the molecular ion of methyl isopropenyl ether, 2, (Scheme 1). CH3 J m/z 100 m / z 72 1 2 Scheme 1. Mechanism of CO loss from the molecular ion of 2,4pentanedione proposed by Zamir et a/.' 5.
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