Abstract
The unimolecular fragmentations of 1,1,1,3,3,3-hexamethyldisilazane (1), and 1,1,3,3-tetramethyldisilazane (2) were investigated by mass-analyzed ion kinetic energy (MIKE) spectra. D-Labelling studies and high resolution data were also included. One of the characteristic fragmentations of these compounds was the loss of CH4 after the expulsion of CH3 or H from the molecular ions.
In the case of 1, D-labelling study indicated that the hydrogen atom bonded to nitrogen atom concerned this CH4 loss. Almost complete scrambling of CH3 groups occurs prior to loss of CH4. An unusual NH3 elimination was found in the MIKE spectra of the [M-CH3-CH4]+ ion for 1 and of the [M-CH3]+ ion for 2.
The fragmentations of 2 were compared with those of its carbon analogue, diisopropylamine, 3.
