- Synthesis of carbosilane dendrimers based on tetrakis(phenylethynyl)silane
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Carbosilane dendrimers of first to third generation were synthesized, using alkynylation/hydrosilation cycles with lithium phenylacetylide and dichloromethylsilane as building blocks and tetrakis(phenylethynyl)silane as a core molecule. The analysis of th
- Kim, Chungkyun,Kim, Moon
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- Zn(OTf)2/i-Pr2NEt promoted synthesis of tetraalkynylsilanes
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An efficient method is reported for the synthesis of tetraalkynylsilanes via the Zn(OTf)2/i-Pr2NEt promoted reaction of silicon tetrachloride with different 1-alkynes.
- Spesivaya, Ekaterina S.,Lupanova, Ida A.,Konshina, Dzhamilya N.,Konshin, Valery V.
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supporting information
(2020/12/29)
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- METHOD FOR PRODUCING ORGANOSILICON COMPOUND USING HALOSILANE AS RAW MATERIAL
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PROBLEM TO BE SOLVED: To provide a novel method for producing an organosilicon compound. SOLUTION: The method for producing an organosilicon compound includes a reaction step (I) of reacting a halosilane represented by formula (a) with a compound containing a hydrocarbon group represented by formula (b) in the presence of an organic base to generate an organosilicon compound represented by formula (c). (In the formula (I), n is an integer of 0-3; each R1 independently represents a hydrogen atom or a C1-20 hydrocarbon group which may contain a heteroatom; X represents a bromo group (-Br) or a chloro group (-Cl); and R2 represents a compound containing a hydrocarbon group.) SELECTED DRAWING: Figure 1 COPYRIGHT: (C)2020,JPOandINPIT
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Paragraph 0047; 0055
(2019/12/10)
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- Alkynylsilanes and alkynyl(vinyl)silanes. synthesis, molecular structures and multinuclear magnetic resonance study
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Alkynylsilanes bearing one to four alkynyl groups at silicon, with organyl groups (Me, Ph, Vin), H, Cl at silicon, and with substituents H, nBu, tBu, Ph, C6H4-4-Me, 3-thienyl, CH 2NMe2 at t
- Wrackmeyer, Bernd,Khan, Ezzat,Bayer, Stefan,Tok, Oleg L.,Klimkina, Elena V.,Milius, Wolfgang,Kempe, Rhett
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experimental part
p. 725 - 744
(2011/01/11)
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- Synthesis of some di- and tricyclic silaalkanes
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The mono-, di- and spirocyclic silaalkanes 5, 6 and 9/10 are readily prepared from the di- and tetraallylsilanes 4 and 8 respectively by Cp2Zr induced ring forming reactions. The diallylsilole 16 reacts at 0°C and in presence of an excess of Cp2Zr to the tricyclic compound 19 whereas the silaspiro[4.4]nonadienes 21 and 22 are formed at room temperature. High stereoselectivity is observed in all of these Cp2Zr induced cyclization reactions.
- Teng, Zhu,Boss, Christoph,Keese, Reinhart
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p. 12979 - 12990
(2007/10/03)
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- Organosubstituted 1,1'-Spirobisiloles and 1,1'-Spirobigermoles by Fourfold Organoboration of Tetra-1-alkynylsilanes and -germanes
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Si(CCR)4 R)4 nonatetraenes via the mono- and bisethyloboration compounds 3 or 4 (e.g. 3b, 4c) with different rates: Ge >> Si; Me > Ph.For comparison, compounds Sn(CR)4 react with Et3B in the absence of a solvent to mixtures of various spirotin compounds (5f, 5g, 6f, 8f, 9g, 10g, 11g) of which only 9g (R = Ph) corresponds to the spirosilanes and -germanes.This is the result of effective competition between intramolecular and intermolecular organoboration in the case of the tetra-1-alkynyltin compounds.The protodeborylation of 1a, b and 2d, e with MeCO2H leads to 12a, b and 13d, e, respectively. 12a isomerises by UV irradiation to allyl isomers 12a'.From 12a with 2 equiv. of maleic anhydride the 1:2 addition compound 14a is obtained, the autaddition of 12a, d leads to 15a, d.Spiro compound 12a reacts with (OC)5Fe or CpCo(C2H4)2 to give the cyclodiastereomeric η4-complexes 2-12a (16a1-a4; X-ray structure analysis of meso-16a1), (OC)3Fe-12a (17a) and (CpCo)2-12a (18a1-a4). - All products were characterized by multinuclear NMR, including measurements of the coupling constants 1J(13C13C), 2J(29Si29Si), nJ(29Si13C) and nJ(119Sn13C). Key Words: Silanes, tetra-1-alkynyl- / Germanes, tetra-1-alkynyl- / 1,1-Ethyloboration, intermolecular / 1,1-Vinyloboration, intramolecular / Spirosilanes / Spirogermanes / Protodeborylation / Transition metals, η4-complexes of
- Koester, Roland,Seidel, Guenter,Klopp, Ingo,Krueger, Carl,Kehr, Gerald,et al.
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p. 1385 - 1396
(2007/10/02)
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