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 CH
4 after the expulsion of CH
3 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 CH
4 loss. Almost complete scrambling of CH
3 groups occurs prior to loss of CH
4. An unusual NH
3 elimination was found in the MIKE spectra of the [M-CH
3-CH
4]
+ ion for
1 and of the [M-CH
3]
+ ion for
2.
The fragmentations of
2 were compared with those of its carbon analogue, diisopropylamine,
3.
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