- METHOD FOR PRODUCING DIALKYLAMINOSILANE
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A method for safely and efficiently producing high-purity dialkylaminosilane. Dialkylamine is fed simultaneously during feeding chlorosilane in the presence of metal to cause reaction. For example, chlorosilane and dialkylamine are fed, and then only dialkylamine is fed to cause reaction, whereby dialkylaminosilane is produced.
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Paragraph 0066-0070
(2020/05/06)
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- Synthesis of tetrakis(dialkylamino)silanes
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A method of synthesizing a substantially pure homoleptic tetrakis secondary amine derivative of silicon, said derivative being substantially free of halogen and having the formula: [in-line-formulae]Si(NRR1)4 [/in-line-formulae]wherein: R and R1 are the same or different and are substituted or unsubstituted straight or branched chain alkyl, groups having from 1 to 6 carbon atoms, said method comprising reacting a silicon halide having the formula: [in-line-formulae]SiX4 [/in-line-formulae]wherein: X is bromine or iodine, with an excess of a secondary amine having the formula: [in-line-formulae]HNRR1 [/in-line-formulae]wherein: R and R1 are as defined as above, for a time and under conditions sufficient to produce a reaction product mixture containing the desired product, Si(NRR1)4.
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Page/Page column 3
(2008/06/13)
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- Organometallic compound, its synthesis method, and solution raw material and metal-containing thin film containing the same
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The organometallic compound of the present invention is a compound that has bonds between metal atoms and nitrogen atoms or bonds between semimetal atoms and nitrogen atoms, and the content of chlorine in the compound is 200 ppm or less and the content of water is 30 ppm or less. In addition, the general formula of this compound is represented by the following formula (1): M[(R1)2N](n?s)(R2)s??(1) wherein, M represents a metal atom or semimetal atom, with the metal atom being Hf, Zr, Ta, Ti, Ce, Al, V, La, Nb or Ni, and the semimetal atom being Si, R1 represents a methyl group or ethyl group, R2 represents an ethyl group, n represents the valence of M, and s represents an integer of 0 to n?1.
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- Hydride and fluoride transfer reactions accompanying nucleophilic substitution at pentacoordinate silicon
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The syntheses of aminoazasilatranes of the type R2NSi(R′NCH2CH2)3N (R′ = H, R = H (2a), CH3 (3a), CH2CH3 (4a), Si(CH3)3 (6a), R′ = CH3, R = H (2b), CH3 (3b), CH2CH3 (4b), Si(CH3)3 (6b) via nucleophilic substitution reactions of ClSi(R′NCH2CH2)3N (R′ = H (7a), R′ = CH3 (7b), respectively) with amide anions are reported. Reactivities of 7a and 7b toward other nucleophilic reagents such as alkyllithiums and Group 1 metal alkoxides are also described. It is found that the equatorial NR′ functionalities significantly influence the reaction pathways. With strong bases, lithiation of the equatorial NH hydrogens of 7a predominated along with some nucleophilic substitution products and hydride transfer product HSi(HNCH2CH2)3N, 1a. With 7b, however, equatorial nitrogen lithiation is precluded and its reaction with nucleophiles can produce substantial amounts of nucleophilic substitution product as well as hydride transfer product HSi(CH3NCH2CH2)3N, 1b. The relative ratios of these products depend substantially on stereoelectronic factors, the nature of the nucleophilic reagents, and the reaction conditions. In the case of the reaction of 7b with BrC6F5/n-BuLi, three products, namely, C6F5Si(CH3NCH2CH2) 3N (13b), FSi(CH3NCH2CH2)3N (14b), and C6F5Si(CH3NCH2CH2) 2(ο-C6F4CH3NCH 2CH2)N (15) formed in an approximate ratio of 1:2:1. The formation of 15 is attributed to perfluorobenzyne insertion into a Si-Neq bond of (13b). Interestingly, the plane defined by the axial NSi2 moiety in 6a is found to be fixed at the apical position of the silicon, providing an interesting example of pπ-dπ interaction between a pentacoordinate silicon and a nitrogen. However, the axial moiety in analogue 6b freely rotates around the apical Si-N bond due to steric interactions with nearby methyl groups on the cage.
- Wan, Yanjian,Verkade, John G.
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p. 141 - 156
(2007/10/02)
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- Preparation of New Monomeric, Oligomeric, and Polymeric Silyl Triflates
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The highly reactive silyl triflates R3SiOSO2CF3 are valuable reagents in organosilicon chemistry.New triflate derivatives of mono- and oligosilanes have been prepared by substitution of phenyl groups or hydrogen atoms for the trifluoromethanesulfonyl group.The presence of the electron-withdrawing triflate group leads to a strong deactivation of the other substituents at the silicon atom, and the displacement of a second phenyl group at the same silicon atom is much slower than the first step.For this reason in the case of phenylated oligosilanes stepwisemonosubstitution of the silicon atoms has been found.Other new oligomeric silyl triflates are obtained by reaction of silanediyl(triyl) bis(tris)(trifluoromethanesulfonates) with lithium derivatives of organosilicon compounds.Finally, the cleavage of silicon - phenyl bonds of poly by CF3SO3H leads to triflate derivatives of polysilanes. Key Words: Silyl triflates / Organosilanes
- Uhlig, Wolfram
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