- An ESR study on structures of a series of silylnitrenes
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Structures of a series of silylnitrenes formed from silyl azides were investigated by means of ESR. γ-Irradiation and photo-illumination of all the silyl azides resulted in the formation of triplet states even for those having two or three Si-N3 groups in a molecule. ESR spectra of the silylnitrenes exhibited a part of the fine structure at around 820 mT. All the silyl azides studied gave nearly identical D-values (ca. 1.5cm-1) and much larger than those in phenylnitrenes. The results suggested that electron spins are localized in the nitrogen p-orbitals to a large extent and was interpreted in terms of a mono-silane linkage of nitrene, -Si-N:, i.e., interrupting spin delocalization.
- Itagaki, Yoshiteru,Iseoka, Takashi,Iida, Toshiyuki,Ohshita, Joji,Shiotani, Masaru,Kunai, Atsutaka
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p. 249 - 254
(2007/10/03)
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- Compositions of and new uses for N-acylanilinobutyric acids
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Pharmaceutically-acceptable compositions containing, as an active ingredient, at least one N-acylanilinobutyric acid have uses unrelated to the choleretic activity suggested in U.S. Pat. No. 3,780,095. Moreover, the further uses generally involve administration of smaller doses than would be required to obtain a choleretic effect. The new uses include: a) increasing the gastrointestinal enzyme secretion and b) tonicizing the cardiovascular system. The increase of the gastrointestinal enzyme secretion is applied in the treatment of different diseases such as treatment of sprue, treatment of indigestion, treatment of acute and chronic pancreatitis, therapy for degenerated intestine mucous membrane, treatment of stomach spasms, treatment of stomach ulcers, treatment of diseases where the application of an antigastrin is indicated. The tonicizing of the cardiovascular system is applied in, e.g., increasing the circulation of blood in internal organs, increasing the heart force, reating disturbances in the liver function.
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- Facile preparation of silyl azides with dipolar aprotic solvents
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The reaction of sodium azide with chlorosilanes in hexamethylphosphoric triamide or dimethylformamide at room temperature affords a high yield preparation of silyl azides, e.g. Me3SiN3,Me2Si(N3)2, PhMeSi(N3)2 and Ph2Si(N3)2. For characterization, the azides may be converted to silyphosphiimies, R3Si-N=PPh3.
- S. Washburne, Stephen,R. Peterson Jr., William
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p. 153 - 156
(2007/10/05)
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