Fumio Okada
Shin-Etsu Chemical
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Publication
Featured researches published by Fumio Okada.
Journal of Organometallic Chemistry | 1997
Shigeru Mori; Fumio Okada; Osamu Sekiguchi; Masao Fujishige; Risei Koitabashi; Susumu Tajima
Abstract 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)2CO is eliminated from [3-CH3]+, giving rise to the peak at m z 43 , but the loss of (CH3)2SiO does not occur from [1-CH3]+. In the case of 2+·, an interesting fluorine atom (F) migration is observed.
Journal of Organometallic Chemistry | 1995
Shigeru Mori; Fumio Okada; Takeshi Kinoshita; Kayoko Kawazoe; Mitsuhito Takahashi; Susumu Tajima
Abstract The spontaneous unimolecular dissociation reaction of the molecular ion of dimethoxydiphenylsilane (1) has been investigated by mass-analyzed ion kinetic energy spectroscopy, collision-induced dissociation, a D-labeling study and high resolution data. The results are compared with those of the corresponding carbon analogue, dimethoxydiphenylmethane (2). The fragmentation of the metastable 1.+ is more complex than that of 2.+. The latter eliminates the methoxy radical only, whereas the former eliminates methanol and benzene molecules, and C7H7 radical in addition to the formation of the molecular ion of biphenyl (3). The intensity of the [MC6H5]+ ion at m/z = 167 is much larger than that of [MOCH3]+ ion at m/z = 213 in the normal mass spectrum of 1. On the contrary, in the case of 2, the intensity of [MC6H5]+ ions is smaller than that of [MOCH3]3+ ions.
Archive | 1984
Fumio Okada; Toshio Oba; Morizo Nakazato
Archive | 1987
Masaki Tanaka; Fumio Okada; Toshio Oba; Hiroshi Oohashi; Tatuo Tanaka
Archive | 1986
Isao Sasaki; Akira Yanagase; Yasunori Kawachi; Tetsuya Mayuzumi; Toshio Oba; Fumio Okada
Archive | 1986
Kunio Itoh; Shohei Kozakai; Yoshinori Hida; Hiroshige Okinoshima; Fumio Okada; Toshio Oba; Hisashi Shimizu; Yuji Hinoto; Hiroshi Yoshioka
Archive | 1986
Hiroshi Ohashi; Kiyohiro Kondow; Fumio Okada; Masaki Tanaka
Archive | 1985
Kunio Itoh; Fumio Okada; Yasushi Yamamoto; Hisashi Aoki
Archive | 1986
Fumio Okada; Nobuyuki Terae; Kiyohiro Kondou
Archive | 1988
Yasuaki Hara; Fumio Okada