Journal of Organometallic Chemistry p. 277 - 282 (1997)
Update date:2022-08-29
Topics:
Mori, Shigeru
Okada, Fumio
Sekiguchi, Osamu
Fujishige, Masao
Koitabashi, Risei
Tajima, Susumu
The unimolecular metastable dissociation of trimethylsilyl acetate, CH3COOSi(CH3)3 (1), and its fluorine analogue, trimethylsilyl trifluoroacetate, CF3COOSi(CH3)3 (2), upon electron impact have been investigated by means of a B/E linked scan, high resolution data, and D-labeling. The results are compared with those of the carbon analogue, tert-butyl acetate, CH3COOC(CH3)3 (3). No molecular ion of any of these compounds can be observed, but loss of CH3 occurs exclusively from the trimethylsilyl or tert-butyl groups. The fragmentation of 1+. is slightly different from that of 3+., and quite different from that of 2+.. In the case of 3+., (CH3)2C=O is eliminated from [3-CH3]+, giving rise to the peak at m/z 43, but the loss of (CH3)2Si=O does not occur from [1-CH3]+. In the case of 2+., an interesting fluorine atom (F) migration is observed.
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