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Metastable ion study of organosilicon compounds. Part III—trimethoxyphenylsilane

✍ Scribed by Susumu Tajima; Hiroyuki Iida; Seiji Tobita; Fumio Okada; Eiichi Tabei; Shigeru Mori

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
371 KB
Volume
25
Category
Article
ISSN
1076-5174

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✦ Synopsis

The unimolecular decomposition of trimethoxyphenylsilane (1) was investigated by mass-analysed ion kinetic energy (MIKE) spectrometry, deuterium-labelling studies and from high resolution data. The characteristic fragmentations of metastable molecular ion of 1 were losses of C6H6 and C,H,' with rearrangements. Almost complete H/D scrambling occurred in the molecular ion prior to these decompositions. The other important fragmentation routes corresponded to expulsions of CH,O' and C6H,'. These fragmentations were followed by consecutive elimination of an H,CO molecule, as commonly observed in the mass spectra of alkoxysilanes. In these fragmentation processes, H/D scrambling increased as the internal energy of the molecular ion was lowered. The fragmentations of 1 were compared with those of its carbon analogue, a,a,a-trimethoxytoluene.

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