- From the selective cleavage of the Si-O-Si bond in disiloxanes to zwitterionic, water-stable zinc silanolates
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Zinc salts do Si-O's: Organosilicon chemistry is crucially determined by the high stability and chemical resistance of the Si-O-Si bond. The formation and structural existence of water-stable metallasilanolates demonstrate both the possibility to cleave the Si-O-Si bond with simple zinc compounds under mild conditions as well as the existence of such molecular metallasilanolates in the presence of water.
- Daeschlein, Christian,O. Bauer, Jonathan,Strohmann, Carsten
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- Silylated derivatives of N-(2-hydroxyphenyl)acetamide: Synthesis and structure
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The N-(2-(trimethylsilyloxy)phenyl)acetamide 1 was synthesized via reaction of N-(2-hydroxyphenyl)acetamide with chlorotrimethylsilane. Transsilylation of new compound 1 by chloro(chloromethyl)dimethylsilane leads to 4-acetyl-2,2-dimethyl-3,4-dihydro-2H-1,4,2-benzoxazasiline 3. The structures of the new compounds were investigated by 1H, 13C and 29Si NMR spectroscopy, X-ray single-crystal analysis, FTIR spectroscopy and DFT methods.
- Nikonov, Alexey Yu.,Sterkhova, Irina V.,Lazarev, Igor M.,Albanov, Alexander I.,Lazareva, Natalya F.
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- Dicationic disiloxane ionic liquids as heat transfer agents in vacuo
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Bis(trifluoromethylsulfonyl)imidic dicationic liquids containing a disiloxane linker between the imidazole cations have been synthesized. Their thermal stability was estimated, and their melting points, viscosity, and volatility in vacuo were measured. The opportunity to use these ionic liquids as heat transfer agents in a dynamic vacuum has been shown.
- Krasovskiy,Kapustin,Gorbatsevich,Glukhov,Chernikova,Koroteev,Kustov
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p. 301 - 308
(2021/03/03)
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- Heteroatom-containing hydroxyalkyl disiloxane and preparation method and application thereof
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The invention provides heteroatom-containing hydroxyalkyl disiloxane and a preparation method and application thereof. The preparation method comprises the steps of preparing a hydrolysis condensationproduct by using chlorosilane (II) as a starting material through a hydrolysis condensation reaction; and carrying out nucleophilic substitution or Williamson etherification reaction on a chloroalkylgroup in the hydrolysis condensation product and a mercapto group, an amine group or an alkoxide group in the hydroxyl compound (III) to obtain the heteroatom-containing hydroxyalkyl disiloxane. Thepreparation method is simple and convenient in steps, mild in reaction conditions, easy to realize and control in reaction conditions, short in preparation period, low in cost and high in target product yield and purity. The heteroatom-containing hydroxyalkyl disiloxane prepared by the preparation method disclosed by the invention can be used for preparing novel silicon-containing polymers such ashydroxyalkyl-terminated polysiloxane or organosilicon modified polyurethane (urea) or polyester, so that the material is endowed with better performance and wider application.
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Paragraph 0048-0053; 0074-0077; 0094-0097
(2020/02/20)
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- Properties of dicationic disiloxane ionic liquids
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A number of dicationic ionic liquids with a disiloxane linker between imidazolium cations and bis(trifluoromethylsulfonyl)imide anion were synthesized and characterized. Melting points, viscosity, and volatility in a vacuum were measured; the thermal and hydrolytic stability of ionic liquids were also studied. The dependence of the properties on the structure of substituents in the cation of the ionic liquid was demonstrated.
- Krasovskiy, Vladimir G.,Kapustin, Gennady I.,Gorbatsevich, Olga B.,Glukhov, Lev M.,Chernikova, Elena A.,Koroteev, Anatoly A.,Kustov, Leonid M.
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supporting information
(2020/07/10)
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- Dicationic polysiloxane ionic liquids
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Dicationic ionic liquids with bis(trifluoromethylsulfonyl)imide anions and dimethylimidazolic moieties linked by the polymeric siloxane chain in the cation structure have been synthesized. Thermal stability of the compounds synthesised was studied by TGA; glass transition temperatures, viscosities and volatility in vacuo were measured. Applicability of these ionic liquids as heat carriers under high dynamic vacuum conditions is shown.
- Krasovskiy,Glukhov,Chernikova,Kapustin,Gorbatsevich,Koroteev,Kustov
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p. 1269 - 1277
(2017/12/02)
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- SILICON BASED DRUG CONJUGATES AND METHODS OF USING SAME
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Described herein are silicon based conjugates capable of delivering one or more payload moieties to a target cell or tissue. Contemplated conjugates may include a silicon-heteroatom core, one or more optional catalytic moieties, a targeting moiety that permits accumulation of the conjugate within a target cell or tissue, one or more payload moieties (e.g., a therapeutic agent or imaging agent), and two or more non-interfering moieties covalently bound to the silicon-heteroatom core.
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Paragraph 0458; 0465; 0466
(2017/08/07)
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- Synthesis and properties of dicationic ionic liquids containing a siloxane structural moiety
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Five new ionic liquids formed by doubly charged cations containing a siloxane moiety and bis(trifluoromethylsulfonyl) imide anion are synthesized and characterized. Their thermal stability is studied by means of TGA; melting points (glass transition temperatures) and densities are measured. The temperature dependences of kinematic viscosity of the obtained ionic liquids are presented along with their approximations by the Vogel-Tammann-Fulcher equation.
- Glukhov,Krasovskiy,Chernikova,Kapustin,Kustov,Koroteev
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p. 2204 - 2209
(2015/11/17)
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- Synthesis of (chloromethyl)dimethylsilanol
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Abstract (Chloromethyl)dimethylsilanol was synthesized by the hydrolysis of (chloromethyl)dimethylchlorosilane, N-[(chloromethyl)dimethylsilyl]amines, or N-(chloromethyl)dimethylsilyl-N-methylamide of diisopropylphosphoric acid. Graphical abstract: [Figure not available: see fulltext.]
- Lazareva, Nataliya F.,Nikonov, Alexey Yu
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p. 983 - 986
(2015/08/06)
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- Synthesis and characterization of some bis(hydroxyalkyl)- and bis(hydroxyester)-functionalized disiloxanes
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Novel hydroxyester disiloxanes (1,3-bis(6-hydroxyhexa noylmethyl)-1,1,3,3- tetramethyl disiloxane and 3-bis(2-hydroxypropanoylmethyl)tetramethyl disiloxane) were synthesized, and preparation of other known monomers, namely 1,3-bis(hydroxypropyl)-1,1,3,3-tetramethyl disiloxane, 1,3- bis(hydroxyethoxypropyl)-1,1,3,3-tetramethyl disiloxane and 1,3- bis(hydroxymethyl)-1,1,3,3-tetramethyl disiloxane was developed to obtain better yields and reduce production time and expense. All compounds were characterized by infrared spectroscopy, using 1H NMR, 13C NMR, and 29Si NMR and were reacted with diisocyanates, resulting in poly(siloxane-urethane) copolymers with unique properties.
- Pusztai, Erika,Nagy, Jozsef,Wagner, Oedoen
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- Siloxane triblock copolymers containing polyethyleneoxide
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Polydimethylsiloxane-polyethyleneoxide block copolymers containing Si-C bonds were synthesized by the condensation reactions of α,ω-bis (chloromethyl) polydimethylsiloxane and α,ω-bis (hydroxy) polyethyleneoxide oligomers, in toluene. The obtained products were characterized by IR, 1H-NMR and 13C-NMR spectrometry, GPC and TGA analysis.
- Hamciuc, Viorica,Pricop, Lucia,Marcu, Mihai,Vlad, Stelian,Pricop, Denisa-Simona
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- Reaction of chloro(chlorodimethyl)dimethylsilane with O-silylurethanes and nicotinic hydrazide in the presence of hexamethyldisilazane
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The reaction of chloro(chlorodimethyl)dimethylsilane and hexamethyldisilazane with O-silylurethanes and nicotinic hydrazide gives rise to products whose structure is determined by the composition, structure, and basicity of intermediate compounds. The rea
- Kirilin,Belova,Zhvakina,Chernyshev
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p. 1539 - 1542
(2007/10/03)
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- The effect of α-chloro substitution on the reactivity of β-functional silanes
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Some compounds with the general formula ClCH2Me2SiCH2CH2Y have been prepared and their solvolysis rates determined.The compounds with Y=OH or OCH3 underwent the normal solvolysis reaction involving elimination of ethene.The compound with Y=Cl reacted but did not produce alkene.Keywords: Silicon; Mechanism
- Bratt, S.,Jarvie, A. W. P.
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p. C26 - C27
(2007/10/02)
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- Selectivite de la scission Si-C dans des composes du type Me3SiCH2Σ; une synthese originale et sure de l'iodoacetate d'ethyle
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The regiochemistry of the electrophilic cleavage of the SiCsp3 bond in compounds Me3SiCH2Σ (Σ = Me, Pr, Cl, COOEt) and Me3SiCHΣ2 (Σ = Cl) has been investigated using ICl, Me3SiOSO2Cl and HO3SCl as the electrophiles.When Σ = Pr or Cl a regioselective cleavage of the Si-CH3 bond was observed, producing silylated chlorosulfonates or sulfates which often were new compounds.With Σ = COOEt a regiospecific splitting of the Si-CH2COOEt bond was observed.This confirms the synthetic potential of ethyl trimethylsilylacetate.
- Bordeau, M.,Djamei, S. M.,Dunogues, J.
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p. 413 - 417
(2007/10/02)
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