4098-30-0Relevant articles and documents
CYCLIC POLYSILANES. XIX. A TEMPERATURE STUDY OF REDISTRIBUTION EQUILIBRIA BETWEEN PERMETHYLCYCLOPOLYSILANES
Brough, Lawrence F.,West, Robert
, p. 139 - 146 (1980)
Equilibria among the cyclic compounds (Me2Si)n where n=5, 6 and 7 have been studied between 30-58 deg C.Thermodynamic values for the redistribution reactions between pairs of compounds are, for n=5 -> 6, ΔH=-18 kcal/mole, ΔS=-20 cal/deg. mole; for n=7 -> 6, ΔH -3, ΔS +33; for n=7 -> 5, ΔH +18, ΔS +51.The enthalpies indicate that the stabilities of the rings increase in the order (Me2Si)5 (Me2Si)7 (Me2Si)6.The differences are smaller than corresponding differences among the cycloalkanes, probably because the silicon compounds are less affected by steric repulsions and angle strain.
Preparation and characterization of the inclusion complexes of poly(dimethylsilane)s with cyclodextrins
Okumura, Hiromichi,Kawaguchi, Yoshinori,Harada, Akira
, p. 6422 - 6429 (2003)
β-Cyclodextrin (β-CD) and γ-cyclodextrin (γ-CD) formed inclusion complexes with poly-(dimethylsilane)s (PSi) of various molecular weights to give crystalline compounds. However, α-cyclodextrin (α-CD) did not form complexes with PSi of any molecular weight. The yelds of the γ-CD-PSi inclusion complexes decreased with increasing molecular weight of PSi. In contrast, the yields of the γ-CD-PSi inclusion complexes increased with increasing molecular weight, reached a maximum at molecular weight of around 760, and gradually decreased at higher molecular weight. The chain-length selectivities are totally different between β-CD and γ-CD. The γ-CD-PSi inclusion complexes are stoichiometric 1:3 (γ-cyclodextrin:monomer unit of PS) compounds. The complexes were isolated and characterized by 1H NMR, 13C CP/MAS NMR, and X-ray diffraction studies. These results suggest that CDs form channel-type complexes with PSi. The optical properties were studied by ultraviolet absorption and fluorescence spectroscopy. The PSi main chain in the cavities of γ-CD takes an all-trans conformation.
METHOD FOR PRODUCING CYCLIC POLYSILANE COMPOUND
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Paragraph 0089-0109, (2021/09/10)
Provided is a method for producing a cyclic polysilane compound simply and easily in a higher yield. The method for producing a cyclic polysilane compound according to an embodiment of the present invention comprising a reaction step of adding a silane monomer compound represented by Formula (I) below into a liquid mixture containing metallic sodium and a lithium salt and allowing them to react: where, R1 and R2 each independently represent a hydrogen atom, a hydrocarbon group, an alkoxy group, or a halogen atom, X1 and X2 each independently represent a halogen atom or an alkoxy group, and ni is an integer that is greater than or equal to 1.
METHOD FOR PRODUCING CYCLIC POLYSILANE COMPOUND
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Paragraph 0073-0080, (2019/10/16)
PROBLEM TO BE SOLVED: To provide a method for producing a cyclic polysilane compound from a silane monomer compound in one pot. SOLUTION: The present invention provides a method for producing a cyclic polysilane compound, including a first step of adding a silane monomer compound to a liquid mixture of a sodium dispersion and a solvent for a reaction, and a second step of adding an aromatic hydrocarbon to the reaction liquid obtained from the first step and heating and refluxing the mixture. SELECTED DRAWING: None COPYRIGHT: (C)2019,JPOandINPIT
METHOD FOR PRODUCING CYCLOHEXASILANE
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Page/Page column, (2014/02/15)
Provided is a method for efficiently obtaining cyclohexasilane using a cyclic silane dianion salt as a raw material without a by-product such as silane gas by a simple device. The method for producing cyclohexasilane has a feature that a cyclic silane dianion salt represented by the following general formula (i) or general formula (ii) is reacted with an aluminum-based reducing agent or a boron-based reducing agent: wherein X represents a halogen element, a represents an integer of 0 to 6, and R1 to R4 each independently represent a hydrogen atom, an alkyl group, or an aryl group; wherein X represents a halogen element, a represents an integer of 0 to 6, and R5 to R8 each independently represent a hydrogen atom, an alkyl group, or an aryl group.
Compounds containing tetradecachlorocyclohexasilane dianion
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, (2008/06/13)
Compounds containing a tetradecachlorocyclohexasilane dianion are prepared by contacting trichlorosilane with a reagent composition comprising a tertiary polyamine. The compound ?pedeta.SiH2 Cl+1 !2 ?Si6 Cl14-2 ! wherein pedeta is N,N,N',N",N"-pentaethyldiethylenetriamine is prepared by contacting trichlorosilane with pedeta. The compound ?Ph4 P+1 !2 ?Si6 Cl14-2 ! is prepared by contacting trichlorosilane with a mixture of N,N,N',N'-tetraethylethylenediamine and triphenylphosphonium chloride. The tetradecachlorocyclohexasilane dianion can be chemically reduced to cyclohexasilane, a compound useful in the deposition of amorphous silicon films. The tetradecachlorcyclohexasilane dianion can also be contacted with a Grignard reagent to form a dodecaorganocyclohexasilane.
Synthesis of α,ω-dihalopermethyloligosilanes and silane-siloxane copolymers
Chernyavskii,Zavin
, p. 1449 - 1453 (2007/10/03)
α,ω-Dibromopermethyloligosilanes, Br(SiMe2)nBr (n = 2-4, 6), were prepared by the reaction of dodecamethylcyclohexasilane with bromine. The reaction of (Me2Si)6 with MCl4 (M = Sn, Ti) proceeds with the cleavage of Si-Si-and Si-C-bonds with the formation of α,ω-dichloropermethyloligosilanes, Cl(SiMe2)nCI (n = 2-4, 6), and chloro derivatives of cyclohexasilane, ClmSi6Me12-m (m = 1, 2). Silane-siloxane copolymers of regular structure were obtained by heterofunctional copolycondensation of α,ω-dihalopermethyloligosilanes with 1,5-dihydroxyhexamethyltrisiloxane.
Synthesis, properties and characterization of octadecamethylbicyclodecasilane
Jenkner, Peter K.,Hengge, Edwin,Czaputa, Rainer,Kratky, Christoph
, p. 83 - 90 (2007/10/02)
The title compound 1 was obtained by Wurtz-type dehalogenative coupling of sym-dichlorotetramethyldisilane and trichloromethylsilane under appropriate conditions.Spectroscopic data for 1 are compared with those for bi(undecamethylcyclopentasilanyl) (2), a possible structural isomer.An X-ray structural study and 29Si-INEPT-INADEQUATE-NMR spectroscopy confirmed that only the trans-isomer of 1 is formed.Several attempts were made to obtain functional derivatives, but monocyclic and catenated oligosilanes were always obtained owing to breakdown of the bicyclic compound.Chemical and electrolytic reduction towards an anion radical was carried out at various temperatures.The ESR signal at 150 K shows an overlap of two distinct species: along with the spectrum of the well known Si5Me10(radical anion) that of a hitherto unknown species was observed.
Sonochemical synthesis of dodecamethylcyclohexasilane
Los', G. P.,Zinov'ev, O. I.,Bashkirova, S. A.,Ivanov, V. I.,Lysova, G. V.,et al.
, p. 307 - 309 (2007/10/02)
A comparative study of the kinetics of the reaction of dimethyldichlorosilane with metallic lithium under strong stirring or in the presence of ultrasonic vibrations in the cavitation regime has been carried out in order to demonstrate the special features of the reaction in the ultrasonic field and to obtain information on its mechanism.
Synthesis, 1H, 13C, and 29Si nuclear magnetic resonance spectra and crystal structure of trans-1,4-diphenyldecamethylcyclohexasilane
Kumar, Kanta,Litt, Morton H.,Chadha, Raj K.,Drake, John E.
, p. 437 - 440 (2007/10/02)
The coupling reaction between PhMeSiCl2 and Me2SiCl2 in the presence of Na/K alloy resulted in a variety of phenylated permethylcyclohexasilanes of which only trans-1,4-Ph2Me10Si6 could be obtained in pure form by repeated recrystallizations.It was studied by means of nmr (1H, 13C, and 29Si) and X-ray crystallography.The crystals are monoclinic, P21/c with a = 10.105(6), b = 14.77(1), c = 9.973(6) Angstroem, β = 94.08(5) deg, V = 1485(2) Angstroem3, and Z = 2 for 1922 unique "observed" reflections and the structure refined to an R index of 0.036.The molecule has site symmetry 1 and the chair conformation of cyclohexane, with the two phenyl rings occupying the equatorial positions.
