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  • 1
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0044-2313
    Keywords: Monomeric trilithium-tris(silylamido)silane ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Monomeric Trilithium-tris[tert-butyldimethylsilylamido]phenylsilane, PhSi[NLi(thf)SiMe2CMe3]3 - Synthesis and Crystal StructureLithiated tert-butyldimethylsilylamine reacts with trifluorophenylsilane in a molar ratio 2:1 or 3:1 to give the bis- and tris(silylamino)silanes 1 [(Me3CSiMe2NH)2SiFPh] and 2 [(Me3CSiMe2NH)3SiPh]. The trilithium derivative 3 [Me3CSiMe2NLi(thf)]3SiPh is obtained in the reaction of 2 with n-BuLi in hexane/thf. 3 crystallizes as a monomer forming three planar four-membered (LiNSiN)-rings. The results of the crystal structure of 3 are discussed.
    Notes: Lithiiertes tert-Butyldimethylsilylamin reagiert mit Trifluorphenylsilan im molaren Verhältnis 2:1 bzw. 3:1 zu den Bis- und Tris(silylamino)silanen 1 [(Me3CSiMe2NH)2 · SiFPh] und 2 [(Me3CSiMe2NH)3SiPh]. In der Reaktion von 2 mit n-BuLi in Hexan/THF entsteht das Trilithiumderivat 3 [Me3CSiMe2NLi(THF)]3SiPh. 3 kristallisiert als Monomer und bildet im Kristall drei planare, viergliedrige (LiNSiN)-Ringe. Die Ergebnisse der Kristallstrukturanalyse von 3 werden mitgeteilt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 584 (1990), S. 87-104 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Fluorosilyl and Fluoroboryl Substituted Cyclotetrasilazanes. Synthesis and Crystal StructuresMono- and dilithiated octamethylcyclotetrasilazanes (1, 6) react with fluorosilanes and F2BN(SiMe3)2, respectively, under retention of the cyclotetrasilazane structure yielding the mono- and disubstituted compounds 2-5 and 7-13. In the reaction of the dilithium compound 6 with a fluorsilane in equivalent amounts, the bicyclic compounds 14 and 15 are obtained. Crystallographic investigations of the compounds 2, 3, 8, and 9 indicate that the monosilylated eight-membered ring has a cradle conformation while the disilylated ring has a chair conformation. The X-ray structure of the bicyclic system 14 indicates that the nitrogen atoms of the Si3N-units have a pyramidal environment.
    Notes: Mono- und dilithiiertes Octamethylcyclotetrasilazan (1, 6) reagieren mit Fluorsilanen bzw. F2BN(SiMe3)2 unter Erhalt des Cyclotetrasilazangerüstes zu den mono- und disubstituierten Verbindungen 2-5 und 7-13. Bei der Umsetzung des Dilithiumsalzes (6) mit einem Fluorsilan im Molverhältnis von 1:1 werden die Bicyclen 14 und 15 erhalten. Kristallographische Untersuchungen von 2, 3, 8 und 9 zeigen, daß der monosilylierte Achtring in einer Wannen-, der disilylierte Achtring in einer Sesselkonformation vorliegt. In der Kristallstruktur des Bicyclus 14 zeigen die Stickstoffatome der Si3N-Einheiten eine pyramidale Umgebung.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 596 (1991), S. 35-46 
    ISSN: 0044-2313
    Keywords: Cyclosilazanes ; Si3N4 ceramics ; preparation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cyclosilazanes as Precursors of Si3N4-CeramicsThe products obtained in the reaction of 1-trimethylsilyl-2,2,4,4,6,6-hexamethylcyclotrisilazane 1 with butyllithium and fluorosilanes depend on the reaction conditions.Lithiated 1 reacts with SiF3N(SiMe3)2 at low temperatures to give the mono- and disubstituted compounds (2, 3) and the 1,3,5,7-tetraaza-2,4,6,8-tetrasilabicyclo-[4.2.0] octane 4. The permethylated bicyclus 5 is formed in the analogous reaction with MeSiF2N(SiMe3)2. At room temperature the monolithium salt of 1 reacts with SiF3N(SiMe3)2 to give the cyclodisilazane 6. 6 forms with butyllithium the lithium derivate 7. 7 reacts with SiF3N(SiMe3)2 to give 8, an isomeric cyclodisilazane of 3. In the reaction of lithiated 1 with Me2SiF2 the silylcoupled cyclodisilazane 9 is obtained, which is a suitable precursor of Si3N4 ceramics.The results of the crystal structure determination of 7 and the results of the pyrolysis of 9 are reported.
    Notes: Die Produktbildung in der Reaktion von 1-Trimethylsilyl-2,2,4,4,6,6-hexamethylcyclotrisilazan 1 mit Butyllithium und Fluorsilanen ist durch die Reaktionsbedingungen steuerbar.Lithiiertes 1 reagiert mit F3SiN(SiMe3)2 bei tiefen Temperaturen unter Bildung der Mono- und Disubstitutionsverbindungen 2, 3 sowie des 1,3,5,7-Tetraaza-2,4,6,8-tetrasilabicyclo [4.2.0] octans 4. Ein permethylierter Bicyclus (5) entsteht in analoger Reaktion mit MeSiF2N(SiMe3)2. Bei Raumtemperatur reagiert das Monolithiumsalz von 1 mit F3SiN(SiMe3)2 unter Kontraktion zum Cyclodisilazan 6. 6 bildet mit Butyllithium das Lithiumderivat 7. 7 reagiert mit F3SiN(SiMe3)2 zu 8, dem zu 3 isomeren Cyclodisilazan. In der Reaktion von lithiiertem 1 mit Me2SiF2 wird das silylverbrückte Cyclodisilazan 9 erhalten, das in Pyrolysereaktionen ein geeignetes Ausgangsmaterial für Si3N4-Keramiken darstellt. Die Resultate der Röntgenstrukturanalyse von 7 und der Pyrolyse von 9 werden mitgeteilt.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 608 (1992), S. 147-152 
    ISSN: 0044-2313
    Keywords: 2,4,6-Tri-t-butylphenyl-substituted amino-imino boranes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Supermesityl stabilized IminoboranesAmino-iminoboranes R′(SiMe3)N-B≡N-R: IIc (R′ = CHMe2), IId (R′= CMe3) and IIe (R′ = SiMe3) carrying the supermesityl group (R) on the imino nitrogen atoms have been prepared from the corresponding fluorobis(amino)boranes Ic-e by HF-elimination using t-BuLi (IIc, d) or n-lithio-bis(trimethylsilyl)amid (IIe). The Amino-iminoboranes are thermally stable at room temperature. Upon treatment of the fluorobis(amino)boranes Ia, Ib, Ie with t-BuLi, LiF and HN(SiMe3)R′ are eliminated and the B-t-butyl substituted iminoborane III is formed. The compounds are characterized by elementar analyses and spectroscopic data (MS, IR, NMR). An X-ray diffraction study has been performed for II d.
    Notes: Amino-imino-borane R′(SiMe3)N-B≡N-R:IIc (R′ = CHMe2), IId (R′= CMe3) und IIe (R′ = SiMe3) mit R = 2,4,6-Tri-t-butylphenyl- wurden aus den entsprechenden Fluorbis(amino)boranen Ic-e durch HF-Eliminierung mit t-Butyllithium (IIc, IId) bzw. Lithiumbis(trimethylislyl)amid (IIe) erhalten. IIc-e sind thermisch stabil und bei Raumtemperatur unbegrenzt haltbar. Die Umsetzungen der Fluorbis(amino)borane Ia (R′ = Me), Ib(R′ = CH2Me) und Ie (R′ = SiMe3) mit t- Butyllithium führen zur Abspaltung von LiF und HN(SiMe3)R′, wobei sich in allen Fällen des B-t-butyl-substituierte Iminoboran III bildet. Die Verbindungen sind elementaranalytisch und spektroskopisch (MS, IR, NMR) charakterisiert. Eine Röntgenstrukturanalyse wurde von IId durchgeführt.
    Additional Material: 1 Ill.
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  • 6
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 582 (1990), S. 151-161 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses, Halogeno-Exchange Reactions, and Crystal Structures of Functional SilylaminesLithium compounds of aminofluorosilanes (1-7) react with MHal4 (M = Si, Ge, Sn; Hal = Cl, Br) to give compounds of the type (8-10, 12, 14: M = Si, 13, 15, 16: M = Ge, 17: M = Sn). 11, 12, 14, R2SiHalSiHal2F (11, 12: Hal = Cl, 14. Hal = Br), are obtained by an intermolecular halogeno exchange. The halogeno exchange depends on the substituents and is only observed by halogenated disilazanes with the substituents R = alkyl and aryl. The crystal structures of 8 and 12 were determined.
    Notes: Die Lithiumverbindungen der Aminofluorsilane (1-7) reagieren mit MHal4 (M = Si, Ge, Sn; Hal = Cl, Br) zu Verbindungen des Typs (8-10, 12, 14: M = Si, 13, 15, 16: M = Ge, 17: M = Sn). Unter intermolekularem Halogenaustausch werden 11, 12 und 14 erhalten, R2SiHalSiHal2F (11, 12: Hal = Cl, 14: Hal = Br). Der Halogenaustausch ist substituentenabhängig und wird nur an halogenierten Disilazanen mit den Substituenten R = Alkyl und Aryl beobachtet. Von 8 und 12 wurde eine Kristallstrukturanalyse durchgeführt.
    Additional Material: 2 Ill.
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  • 8
    ISSN: 0044-2313
    Keywords: Indium-phosphorus four-membered ring ; phosphide ; phosphorus-indium bond ; phosphorus-hydrogen bond ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Crystal Structure of [(Me3SiCH2)2InP(H)Ad]2Reaction of (Me3SiCH2)3 In with AdPH2 (Ad = adamantyl) in the presence of AgNO3 leads to [(Me3SiCH2)2InP(H)Ad]2 1 in 30% yield. The crystal structure of 1 is discussed.
    Notes: Die Reaktion von (Me3SiCH2)3 In mit AdPH2 (Ad = Adamantyl) führt in Gegenwart katalytischer Mengen AgNO3 unter Abspaltung von Tetramethylsilan in 30% Ausbeute zu [(Me3SiCH2)2InP(H)Ad]2 1. Die Kristallstruktur von 1 wird diskutiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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