Silane tetrakis

The reaction of halosilanes with alcohols proceeds analogously. Dihinctional amines react with tetrahalosilanes to yield tetrakis(dialkylamino)silanes. 

Hydraulic and Heat-Transfer Fluids. HydrauHc fluids (qv) for high altitude supersonic aircraft and thermal exchange appHcations including solar panels employ fluids such as tetrakis(2-ethyIhexoxy)silane. These products have been marketed under the trade name Coolanol by Monsanto (see Heat-exchangetechnology). 

Model Networks. Constmction of model networks allows development of quantitative stmcture property relationships and provide the abiUty to test the accuracy of the theories of mbber elasticity (251—254). By definition, model networks have controlled molecular weight between cross-links, controlled cross-link functionahty, and controlled molecular weight distribution of cross-linked chains. Sihcones cross-linked by either condensation or addition reactions are ideally suited for these studies because all of the above parameters can be controlled. A typical condensation-cure model network consists of an a, CO-polydimethylsiloxanediol, tetraethoxysilane (or alkyltrimethoxysilane), and a tin-cure catalyst (255). A typical addition-cure model is composed of a, ffl-vinylpolydimethylsiloxane, tetrakis(dimethylsiloxy)silane, and a platinum-cure catalyst (256—258). 

Tetra(alkoxy) silanes such as tetra(methoxy)silane 58 [50, 64], tetra(ethoxy)silane 59 [50], tetra(acetoxy)silane Si(OAc)4 113 [51], tetra(dimethylamino)silane Si(NMe2)4 114 [52, 53], or tetrakis(l-pyrrolidino)silane 115 [53] are readily prepared from SiCh 57 and are available in any amounts. 

Finally, reaction of SiCLi. 57 with HMDSO 2 affords 84% tetrakis(trimethyl-silyloxy)silane 140 and 16% hexakis(trimethylsilyloxy)disiloxane 141, both of which might be very interesting silylating agents, e.g., for silicon surfaces [72]. 140 is also obtained in 38% yield on reaction of SiCL. 57 with excess sodium tri-methylsilanolate 96 [73] (Scheme 3.14). 

General Considerations. The following chemicals were commercially available and used as received 3,3,3-Triphenylpropionic acid (Acros), 1.0 M LiAlH4 in tetrahydrofuran (THF) (Aldrich), pyridinium dichromate (Acros), 2,6 di-tert-butylpyridine (Acros), dichlorodimethylsilane (Acros), tetraethyl orthosilicate (Aldrich), 3-aminopropyltrimethoxy silane (Aldrich), hexamethyldisilazane (Aldrich), tetrakis (diethylamino) titanium (Aldrich), trimethyl silyl chloride (Aldrich), terephthaloyl chloride (Acros), anhydrous toluene (Acros), and n-butyllithium in hexanes (Aldrich). Anhydrous ether, anhydrous THF, anhydrous dichloromethane, and anhydrous hexanes were obtained from a packed bed solvent purification system utilizing columns of copper oxide catalyst and alumina (ether, hexanes) or dual alumina columns (tetrahydrofuran, dichloromethane) (9). Tetramethylcyclopentadiene (Aldrich) was distilled over sodium metal prior to use. p-Aminophenyltrimethoxysilane (Gelest) was purified by recrystallization from methanol. Anhydrous methanol (Acros) was... 

Potassium chlorate Metal phosphinates, 4017 Potassium perchlorate, 4018 Sodium 5-azidotetrazolide, 0551 Sodium chlorate Paper, Static electricity, 4039 Sodium chlorate Wood, 4039 Succinoyl diazide, 1438 Tetrakis(chloroethynyl)silane, 2879 Thianthrenium perchlorate, 3455 Triferrocenylcyclopropenium perchlorate, 3885 See other IGNITION SOURCES... 

Silver chloroacetylide, 0566 Silver trifluoropropynide, 1030 Sodium bromoacetylide, 0581 Sodium chloroacetylide, 0601 Tetrakis(chloroethynyl)silane, 2879 Thallium iodacetylide, 0984 3,3,3-Trifluoropropyne, 1066... 

Tetrakis(trimethylsilyl)silane, (Me3Si)4Si, cannot be oxidized under the same conditions [18], This excludes any direct insertion of an oxygen molecule on the Si—Si bond followed by a molecular rearrangement. 

Nucleophilic fluorine-aryl substitution in iodine pentafluoride with tetrakis(pentafluoro-phcnyl)silane or tris(pentafluorophenyl)bismuthane produces high-purity (pentafluorophen-yl)iodine tetrafluoride in good yield.133,134... 

---