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Organosilicon Compounds (organosilicon + compound)

Distribution by Scientific Domains

Chemistry	50%

Selected Abstracts

ChemInform Abstract: Highly Stereoselective Carbon-Functionalization of Electron-Deficient Arylalkenes by Use of Organosilicon Compounds via Photoinduced Electron Transfer.

CHEMINFORM, Issue 27 2001
Tomoo Hayamizu
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source]

Pyrazole functionalized organo-ceramic hybrids for noble metal separations

AICHE JOURNAL, Issue 10 2005
Jun S. Lee
Abstract A series of pyrazole-functional adsorbents is synthesized by sol,gel processing technology and used to study the extraction characteristics for palladium, platinum, and gold chlorides from leaching solutions. An organosilicon compound, N-(trimethoxysilylpropyl)-pyrazole, is synthesized as the functional precursor for these adsorbents. Hydrothermal treatments for the gelled materials alter pore characteristics without chemical property changes. To study adsorptive extraction of Pd(II), Pt(IV), and Au(III) chlorides, the hydrothermally treated adsorbent is used. The experimental results show that this adsorbent has high Pd(II) uptake capacity (1.41 mmol/g), strong selectivity for Pd(II) chloride over Pt(IV) and Au(III) chlorides, and no reactivity for Cu(II) and Fe(II) in 2.0 M HCl solutions. The material also has sustainable stability over repeated metal loading and stripping in a short column. In addition to the experimental studies, the adsorption processes in batch and packed column systems are successfully modeled by using a pore diffusion model and presented. © 2005 American Institute of Chemical Engineers AIChE J, 2005 [source]

Upper flammability limits of some organosilicon compounds

FIRE AND MATERIALS, Issue 6 2004
Fu-Yu Hshieh
Abstract This paper reports the upper flammability limits of 26 organosilicon compounds commonly used in the silicone industry and investigates the correlation between the upper flammability limit and the net heat of combustion. An empirical equation has been developed to predict the upper flammability limit of organosilicon compounds using the net heat of combustion. Copyright © 2004 John Wiley & Sons, Ltd. [source]

Predicted heats of combustion of some important organosilicon intermediates

FIRE AND MATERIALS, Issue 1 2003
Fu-Yu Hshieh
Abstract This short communication presents the predicted heats of combustion of 308 organosilicon intermediates. The net and gross heats of combustion were predicted using two previously developed empirical equations. These intermediates cover most of the important organosilicon compounds that are manufactured or used in the silicone industry. Copyright © 2003 John Wiley & Sons, Ltd. [source]

Metastable ion study of organosilicon compounds.

JOURNAL OF MASS SPECTROMETRY (INCORP BIOLOGICAL MASS SPECTROMETRY), Issue 7 2001
(CH3)2Si(OCH3), CH3SiH(OCH3), Part XIII: dimethoxydimethylsilane, dimethoxymethylsilane
Abstract Unimolecular metastable fragmentations of dimethoxydimethylsilane, (CH3)2Si(OCH3)2 (MW 120, 1), and dimethoxymethylsilane, CH3SiH(OCH3)2 (MW 106, 2), upon electron impact ionization have been studied by means of mass-analyzed ion kinetic energy (MIKE) spectrometry and the D-labeling technique in conjunction with thermochemistry. The results have been compared with those of the corresponding carbon analogues, 2,2-dimethoxypropane, (CH3)2C(OCH3)2 (MW 104, 3) and 1,1-dimethoxyethane, CH3CH(OCH3)2 (MW 90, 4). In analogy with the cases of 3 and 4, both molecular ions from 1 and 2 are formed at very low abundance at 70 eV, and begin to decompose by the expulsion of the substituents (H, CH3 or OCH3) on the central silicon atom. These decompositions are followed by the loss of a formaldehyde molecule (CH2O), as commonly observed in the mass spectra of methoxysilanes. Further, an ethylene (C2H4) or a dimethyl ether (CH3OCH3) molecule loss is observed in the fragmentation of some intermediate ions generated from 1+· and 2+·, but the mechanisms are different than those in the cases of 3 and 4. Some of these fragmentations are also different than those reported previously. The relative abundance of the ions in many MIKE spectra is explained by the extension of the Stevenson,Audier rule. The reaction, which is in contrast to the rule, however, is rationalized by the energy of the transition state for the reaction, estimated by semi-empirical molecular orbital calculation. The peak at m/z 59 from 2+· consists only of CH3OSi+ ion, whereas the peak from 1+· consists of two different ions, CH3OSi+ and (CH3)2Si+H. The ions CH3OSi+ from 1+· and 2+· are generated by at least two and three separate routes respectively. Copyright © 2001 John Wiley & Sons, Ltd. [source]

Role of Redistribution Reactions in the Polymer Route to Silicon,Carbon,Oxygen Ceramics

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 5 2002
P. Hubert Mutin
Redistribution reactions are used in the synthesis of several preceramic polymers. Moreover, redistributions play a major role in the pyrolysis of these precursors. Examples of thermal redistributions involving the exchange of Si,O/Si,X bonds (X = O, H, C, ,) in polysiloxanes, precursors to silicon,oxygen,carbon ceramics, are given. Redistributions account for the escape of volatile organosilicon compounds, decreasing the yield and modifying the composition of the final ceramic. Moreover, they deeply modify the environment of Si atoms in the residue. At ,900°C, Si,O/Si,C redistributions have reached equilibrium, leading to a random, entropically controlled distribution of sites. At higher temperatures, redistribution equilibria are displaced by the crystallization of SiC. Thus, the structure of the silicon oxycarbide phase (environment of Si atoms) is dependent on the O/Si ratio of the glass and the pyrolysis temperature, but is not directly dependent on the structure of the precursor. [source]

Selective organic synthesis through generation and reactivity control of hyper-coordinate metal species

THE CHEMICAL RECORD, Issue 6 2008
Tamejiro Hiyama
Abstract This paper is a review of my 40 years of research at Kyoto, Sagamihara, and Yokohama, all based on the generation of hyper-coordinate metal species such as ate complexes and pentacoordinate silicates. The topics are: (i) carbenoid reagents for carbon,carbon bond-forming reactions, (ii) nucleophilic substitution at acetal carbons using aluminate reagents, (iii) preparation of magnesium enolates and its reaction with nitriles, (iv) Cr(II) reagents for reduction of organic halides and highly selective carbon,carbon bond formation, (v) organic synthesis with organosilion reagents/fluoride ions, (vi) cross-coupling reaction of organosilicon compounds, and (vii) silicon-based conjugate addition to ,,,-unsaturated carbonyl acceptors. © 2008 The Japan Chemical Journal Forum and Wiley Periodicals, Inc. Chem Rec 8: 337,350; 2008: Published online in Wiley InterScience (www.interscience.wiley.com) DOI 10.1002/tcr.20162 [source]