Silicon chloride oxides

Silicochloroform Silicolluoric Acid Silicon Chloride Silicone Fluids Silicon Tetrachloride Silver Acetate Silver Carbonate Silver Fluoride Silver Iodate Silver Monofluoride Silver Nitrate Silver Oxide Silver Sulfate Silvisar 510 Slaked Lime Slow-Curing Asphalt Sodamide Sodium... 

The free iodine can readily he washed out, but CaCl2 can be removed only incompletely because all the solvents for this substance react with silicon chloride. The reaction will take place quantitatively only if the starting CaSi2 has been finely ground under inert gas or in a solvent. Grinding in air leads to partial oxidation and the reaction remains incomplete. Silicon monochloride prepared in this way is a yellow scaly product whose analysis indicates the exact 1 1 silicon to chlorine ratio. The quantity of hydrogen liberated in alkaline medium is also consistent with the three Si-Si bonds per silicon atom required for the layer structure. 

As an element, silicon is a hard brittle metallic-looking substance which crystallizes in the diamond lattice. It is produced commercially by the electrothermal reduction of silica, resulting in a product which contains about 97 per cent silicon. The element shows no visible oxidation or corrosion at ordinary temperatures and oxidizes very slowly below red heat. Halogens attack it more readily, and chlorination proceeds satisfactorily at 250° C. to form the silicon chlorides which are perhaps the best-known volatile compounds of silicon. Whenever the element is exposed to nascent hydrogen, or its metallic compounds are treated with acids, some hydrides usually are formed, as may be noticed by the odor which such hydrides impart to the gas evolved when cast iron is dissolved in dilute acids. A mixture of concentrated nitric and hydrofluoric acids will dissolve pure silicon, but mineral acids singly will not do so. Hot concentrated solutions of alkalies will dissolve it, however, with the evolution of hydrogen. 

As described previously, flame s3mthesis reactions include the oxidation of silicon chloride to produce silica the oxidation of titanium chloride to produce titania and the oxidation of other metal chlorides (see Table 7.2 also). 

Dibenzylethyl silicon chloride, see Dibenzylethylohlorosilicane. Dibenzylethylsilicyl oxide, 270. 

Heating COCl in a glass tube, or over aluminium(III) chloride or silicon(IV) oxide, at... 

As silicon(IV) oxide is the only common oxide which is not chlorinated by phosgene (see Section 9.4.4) [360], the reaction between phosgene and silicon(IV) chloride was examined both experimentally and theoretically [654] ... 

Although bulk silicon(IV) oxide is not chlorinated by phosgene, it does slowly chlorinate the surface [866]. This phenomenon has been used to chlorinate the surfaces of chrysotile asbestos and nonexpanded vermiculite for grafting to polystyrene for use as a filler for polymers and elastomers [1383,1384]. Moreover, in the presence of aluminium(III) chloride, phosgene will convert silica gel into silicon(IV) chloride at between 400 and 700 C [208a,208b]. 

Chloride Oxides. A variety of chlorooxosilanes, both linear and cyclic, is known. Thus controlled hydrolysis of SiCl4 with moist ether, or interaction of Cl2 and Oz on hot silicon, gives Cl3SiO(SiOCl2) SiCl3, where = 1—4. 

TetraaUcylsilanes are stable compounds. Therefore, it is necessary to activate the compounds for the conpling reaction. Since dialkylsilacyclobutanes have high strain energy, palladium complexes can easily insert into the carbon-silicon bond oxidatively, and the resultant complexes conple with acyl chlorides to give l-sila-2-oxa-3-cyclohex-ene derivatives (Scheme 14). 

Gardner and Katritzky (200) prepared and characterized about 24 amirfo- and hydroxypyridine oxides, and showed that 2-hydroxypyridine 1-oxide exists as the strongly hydrogen-bonded l-hydroxypyrid-2-one. Weiss and Harvey (201) described the water-soluble monovalent 6-coordinated silicon chloride salt, soluble in water and alcohol. The tetrachloroferrate (III)... 

Alk ene oxide may be added to react vrilh HQ formed when alkoxy silicon chloride reacts with silica (in the oil)... 

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