アルキルシラン類のマススペクトル2. メチルプロピルシラン, ジメチルプロピルシラン, トリメチルプロピルシラン, メチルペンチルシラン

概要

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We have studied the fragmentation of four alkylsilanes (CH3SiH2C3H7, (CH3)2SiHC3H7, (CH3)3SiC3H7, CH3SiH2C5H11) under EIMS. The characteristic ions of [M-H]+, [M-H2]+·, m/z 73 and m/z 45 appeared from methylpropylsilane and methylpentylsilane in a similar manner as the fragmentation of butylmethylsilane reported in a previous paper. From the results of deuterium labelled compounds it was confirmed that [M-H]+ is produced by eliminating an H-atom on Si-atom. It was also suggested that [M-H2]+· is produced by eliminating two H-atoms on Si-atom with the H/D scrambling. The ion of m/z 73 is stabilized by σ-π conjugation. The ion of m/z 45 is mainly formed as the secondary scission ion. By replacing an H-atom with a methyl group on Si-atom the mass spectra of the resulting alkylsilanes become similar to those of the corresponding alkanes.
日本質量分析学会の論文