Metastable Ion Study of Organosilicon Compounds Part IV. 1,1,1,3,3,3-Hexamethyldisilazane and 1,1,3,3-Tetramethyldisilazane

抄録

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.