Metastable Ion Study of Organosilicon Compounds. Part XII. 2-Propoxytrimethylsilane, (CH_3)_3SiOCH(CH_3)_2

摘要

Unimolecular decomposition of 2-propoxytrimethylsilane, (CH_3)_3SiOCH(CH_3)_2 (M_w: 132, 1), upon electron impact ionization, has been studied by use of mass-analyzed ion kinetic energy (MIKE) spectrometry and D-labeling technique. The abundance of the molecular ion of 1 is too low to measure the MIKE spectrum. A methyl radical loss occurs from two different groups in 1~+· ；i.e., from either trimethylsilyl group or 2-propyl group. The ion at m/z 117 formed via the latter reaction decomposes into the m/z 73 ion, trimethylsilyl ion, by the loss of acetaldehyde, whereas the ion via the former reaction decomposes exclusively into the m/z 75 ion, hydroxydimethylsilyl ion, by the loss of propene. The methyl loss from the trimethylsilyl group prevails over that from the 2-propyl one.