Fragmentation of Silaspiroalkanes in EI Mass Spectrometry
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概要
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The fragmentations of six silaspiroalkanes combined with four-, five-, and six-membered rings in EI mass spectrometry have been studied by a B/E linked scanning technique and an ab initio MO method. The main fragmentation process from the molecular ion is the consecutive losses of two ethylene molecules which occur via the cleavage of an Si-C bond in each ring of silaspiroalkanes. From the ab initio MO calculation, we found that the initial bond fission occurred in an Si-C bond of the molecular ion. At that time, the cleavage of an Si-C bond occurs in the smaller ring more easily than in the larger one, since the strain on the smaller ring is larger. We found the metastable decomposition due to a CH3 loss from the molecular ions of 4-silaspiro[3.5]nonane, 5-silaspiro[4.4]nonane, and 4-silaspiro[3.4]octane.
- 日本質量分析学会の論文
著者
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YAMAMOTO Masao
Department of Pediatrics, Nippon Medical School
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TAKEUCHI Takae
Department of Chemistry, Faculty of Science, Nara Women's University
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Takeuchi Takae
Department Of Chemistry Faculty Of Science Nara Women's University
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YONEZAKI Naomi
Department of Chemistry, Faculty of Science, Nara Womens University
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Yamamoto Masao
Department Of Anatomy Hiroshima University School Of Medicine
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