1633-09-6Relevant articles and documents
Synthesis and Properties of Ethyl, Propyl, and Butyl Hexa-alkyldisilanes and Tetrakis(tri-alkylsilyl)silanes
Ahmed, Mohammed A. K.,Wragg, David S.,Nilsen, Ola,Fjellv?g, Helmer
, p. 2956 - 2961 (2014)
The preparation of (R 3Si)4Si (R = ethyl, n-propyl, iso-propyl, n-butyl, and iso-butyl) was attempted using the procedure reported for [(CH3)3Si)]4Si.1 The type of alkyl group affected the resulting materials significantly. For R = ethyl, [(C2H5)3Si]2 [hexaethyldisilane (1)] was obtained phase pure if careful fractional distillation (under vacuum) was used, otherwise a mixture of 1, [(C2H5)2Si]4 (octaethyltetra-cyclo-silane), and other unidentified product(s) was obtained. For R = n-propyl a mixture of [(CH3CH2CH)3Si]2 (hexa-n-propyldisilane), [(CH3CH2CH2)2Si]4, (octa-n-propyltetra-cyclo-silane), [(CH3CH2CH2)3Si]4Si {tetrakis(tri-n-propylsilyl)silane} (2)], and other unidentified product(s) was obtained. From this mixture only 2, a new and previously unreported compound, was purified. 2 is the second compound of this type to be reported and is characterized by mass spectrometry (MS), elemental analysis (EA), and thermogravimetry (TG). The crystal structure of 2 is also reported [space group R βar{3}$ (no.148), a = 17.9249(10) ?, c = 12.2752(7) ?, at 100 K]. For R = iso-propyl pure [{(CH3)2CH2}3Si]2 [hexa-iso-propyldisilane (3)] was obtained in a good yield. For R = n-butyl or iso-butyl no phase pure compounds were synthesized. The pure compounds prepared have potential as precursors for the currently problematic atomic layer deposition of silicon, as demonstrated by their complete sublimation under thermal analysis. The sublimation temperature is dependent on the size of the molecule.
Cp2TiPh2-Catalyzed Dehydrogenative Coupling of Polyhydromonosilanes
Nakano, Taichi,Nakamura, Hidehisa,Nagai, Yoichiro
, p. 83 - 86 (1989)
The Cp2TiPh2-catalyzed reaction of dihydrosilanes afforded dehydrogenative coupling products, disilanes and/or trisilanes.The reaction using phenylsilane produced hydride-terminated poly(phenylsilylene) polymers with Mn=730 and Mw=960, which exhibited the longest UV absorption maximum at 245 nm (ε, 5.7x104).
Redox reactions of GeII and SnII dihalides with triethylsilane and triethylgermane
Nosov,Koroteev,Egorov
, p. 1325 - 1328 (2002)
Dihalogermylenes, dihalostannylenes, and their complexes (EI2, ECl2?dioxane, and (CO)5W=ECl2?THF, where E = Ge or Sn), unlike organylgermylenes, are not inserted at the Si-H (Ge-H) bond of triethylsilane (triethylgermane). The reactions of SnI 2, ECl2?dioxane, and (CO)5W=ECl 2?THF (E = Ge or Sn) with Et3E′H (E′ = Si or Ge) occur as redox processes. Depending on the nature of the reagents, the reactions afford products of oxidative coupling (Et3SiSiEt 3) and/or haloiodination (Et3SiX and Et3GeX) of triethylsilane (triethylgermane). The proposed mechanism of these reactions involves the electron transfer to form radical-ion pairs.
An Electroreductive Approach to Radical Silylation via the Activation of Strong Si-Cl Bond
Lu, Lingxiang,Siu, Juno C.,Lai, Yihuan,Lin, Song
supporting information, p. 21272 - 21278 (2020/12/21)
The construction of C(sp3)-Si bonds is important in synthetic, medicinal, and materials chemistry. In this context, reactions mediated by silyl radicals have become increasingly attractive but methods for accessing these intermediates remain limited. We present a new strategy for silyl radical generation via electroreduction of readily available chlorosilanes. At highly biased potentials, electrochemistry grants access to silyl radicals through energetically uphill reductive cleavage of strong Si-Cl bonds. This strategy proved to be general in various alkene silylation reactions including disilylation, hydrosilylation, and allylic silylation under simple and transition-metal-free conditions.
Disilane and preparation method thereof
-
Paragraph 0058-0061, (2020/01/25)
The invention discloses disilane and a preparation method thereof. The preparation method of disilane includes: subjecting a uniformly mixed reaction system containing tertiary hydrosilane and a catalyst to dehydrogenation reaction at a temperature ranging from -10DEG C to 120DEG C to obtain disilane, wherein the catalyst comprises a silver salt. The invention also discloses the disilane preparedby the method. The method for preparation of the disilane by catalyzing tertiary silane dehydrogenation with the silver salt adopts the silver salt to activate the Si-H bond in the silane so as to realize construction of disilane. Therefore, the invention provides an efficient and simple method for preparation of the compound, and the application prospect is wide.
Method for continuously preparing disilane compounds by micro-reaction device
-
Paragraph 0025; 0026; 0035; 0036, (2018/05/16)
The invention discloses a method for continuously preparing disilane compounds by a micro-reaction device. The method comprises the following steps: (1) a solution A is prepared from organosilane by dissolving in a first organic solvent, or is organosilane; (2) a solution B is prepared from an oxidant by dissolving in a second organic solvent, or is an oxidant; (3) the solution A and the solutionB are pumped into a micro-mixer of the micro-reaction device simultaneously for mixing, a product then flows into a microreactor of the micro-reaction device for reaction, and the disilane compounds are prepared, wherein the microreactor is filled with a catalyst. Raw materials required in the method are easily available and have better stability, metal copper compounds are used as a catalyst forcoupling reaction on trisubstituted silanes, and the coupling effect on trisubstituted silanes is better than that of alkali metal catalysts and transition metal catalysts; a micro-channel reactor issuitable for an exothermic coupling reaction due to good mixing and heat transfer performance.
Nucleophilic displacement versus electron transfer in the reactions of alkyl chlorosilanes with electrogenerated aromatic anion radicals
Soualmi, Saida,Dieng, Mamadou,Ourari, Ali,Gningue-Sall, Diariatou,Jouikov, Viatcheslav
, p. 457 - 469 (2015/03/04)
Anion radicals of a series of aromatic compounds (C6H5CN, C6H5COOEt, anthracene, 9,10-dimethyl-, 9,10-diphenyl-and 9-phenylanthracene, pyrene and naphthalene) react with trialkyl chlorosilanes R1R2R3SiCl (R1-3 = Me, Et; R1,2 = Me, R3 = t-Bu) in multiple ways, following classical bimolecular schemes. The ratio of one-electron transfer (ET) to a two-electron process (SN2-like nucleophilic attack of the reduced form of mediator on the chlorosilane, with k2 ? 102-108 M-1 s-1) is inversely related to the steric availability of Si for nucleophilic displacement reactions. The nucleophilic substitution pathway mainly results in mono-and disilylated aromatic products. Paralleling the electrochemical data with DFT calculations, the role of silicophilic solvent (DMF) in SN process was shown to be quite complex because of its involvement into coordination extension at silicon, dynamically modifying energetics of the process along the reaction coordinate. Although 2,2'-bipyridine also forms delocalized persistent anion radicals, they do not induce neither ET nor SN reactions in the same manner as aromatic mediators. Silicophilicity of 2,2'-bipyridine being superior to that of DMF, a R3SiCl·bipy complex of hypercoordinated silicon with electroactive ligand was formed instead, whose reduction requires about 1 V less negative potentials than bipyridine itself.
Gold nanoparticles-catalyzed activation of 1,2-disilanes: Hydrolysis, silyl protection of alcohols and reduction of tert-benzylic alcohols
Gryparis, Charis,Stratakis, Manolis
supporting information, p. 10751 - 10753,3 (2020/09/02)
Gold nanoparticles supported on TiO2 catalyze under mild conditions the activation of a series of 1,2-disilanes towards hydrolysis and alcoholysis, with concomitant evolution of H2 gas. For the case of tert-benzyl alcohols, the main or only pathway is reduction to the corresponding alkanes.
PREPARATION OF SI-SI BOND-BEARING COMPOUNDS
-
Page/Page column 3, (2009/05/28)
Si—Si bond-bearing compounds are effectively prepared by irradiating with radiation or heating Si—H group-bearing silicon compounds in organic solvents in the presence of iron complex catalysts. The Si—Si bond-bearing compounds are useful as a base material in photoresist compositions, ceramic precursor compositions, and conductive compositions.
Electrolytic Behavior of Iodo- and Chlorosilanes. The Formation of Si-Si and Si-sp-C Bonds
Kunai, Atsutaka,Ohnishi, Osamu,Sakurai, Tomohiro,Ishikawa, Mitsuo
, p. 1051 - 1052 (2007/10/03)
Electrolysis of iodosilanes with Al/Pt electrodes in pivalonitrile results in the formation of the Si-Si bonds to give the corresponding disilanes.On the other hand, the electrolysis of various halosilanes such iodo-, chloro-, and fluorosilanes with Pt/Pt electrodes in the presence of phenylacetylene leads to the formation of the Si-sp-carbon bonds to give phenylethynylated products.
