Formation, structure (stereochimie et stereodynamique), et donnees de spectroscopie RMN des composes du titre

Molecular and electronic structure of penta- and hexacoordinate silicon compounds

This critical review summarizes progress of the rapidly developing and very active field of silatrane chemistry. The first part of the review deals with general synthetic approaches used to synthesize different silatranes. The most interesting feature of silatranes, i.e., variation of Si–N bond length on the basis of the axial substituent of Si, and other structural features, are described in the second part with special emphasis on crystallographic and theoretical studies. It is followed by a discussion on the reactivity of various silatranes. Silatranes have now gained acceptance for a wide variety of applications which are summarized in the last section of review. Some of them have extensive interest due to their medical use to heal wounds or stimulate hair-growth (pilotropic activity), biological properties, pharmacological properties e.g. antitumor, anticancer, antibacterial, anti-inflammatory, fungicidal activity, stimulating effect in animal production and seed germination effects. The review focuses on the extended potential of silatranes in sol–gel processes, mesoporous zeotypes, atomic force microscopy, commercial products such as adhesion promoters, polymer formation and rubber compositions. This critical review will be helpful for general researchers, experts, advanced undergraduates and newcomers working on silatrane chemistry as this review presents greater emphasis on synthesis and characterization, structural properties, reactivity and applications of silatranes in the field of biology, material science, sol–gel chemistry, pharmaceutics, agriculture and medicine (311 references).

Silatranes: a review on their synthesis, structure, reactivity and applications

The structure of methyl silatrane (1-methyl-2,8,9-trioxa-5-aza-1-silabicyclo(3.3.3)undecane) as determined by gas phase electron diffraction

Recent Trends in Metal Alkoxide Chemistry

Publisher Summary This chapter focuses on Silicon-29( 29 Si) nuclear magnetic resonance (NMR) spectroscopy One nucleus that has become increasingly important from an NMR point of view is 29 Si Silanes are important to the chemical industry as catalysts or additives in catalyst systems New and better ways to characterize these compounds are urgently needed The Silicon-29 ( 29 Si) isotope is a very difficult nucleus to observe because of its low natural abundance (47 %) and low NMR sensitivity at constant field (784 x 10 -3 ) relative to 1 H This chapter includes compounds of general structure (R 3 - n SiO n ) x , where n > 0, x > 2, and R = alkyl, aryl, or H Silicates and extravalent silicon compounds are described The spectral dispersion for organosilicones may be considerable for certain families of compounds The first, 29 Si NMR results reported on polydimethylsiloxanes showed that individual resonance lines can be found for each different silicon nucleus up to a ten-unit oligomer, surpassing the structural resolution achieved by I3 C and 1 H NMR on the same materials

K. Simon

Papers

Crytal and molecular structures of γ-1-phenylsilatrane: some structural features of silatranes

Crystal and molecular structure of β-1-phenylsilatrane, C12H17NSi

Crystal and molecular structure of γ-1-phenylsilatrane. structural features of silatranes