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  • 1
    Electronic Resource
    Electronic Resource
    Coordination isomerism in pentamethylcyclopentadienyl-substituted iminophosphanes: from classical structures to a .pi.-complexed iminophosphenium ion (1992)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 114 (1992), S. 8857-8862 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00049a018
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  • 2
    Electronic Resource
    Electronic Resource
    Structure of bis(pentamethyldiethylenetriamine)disodium hexasulfide (1993)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 49 (1993), S. 1482-1483 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270193001167
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  • 3
    Electronic Resource
    Electronic Resource
    Structure and crystal packing of 4-aminobenzonitriles and 4-amino-3,5-dimethylbenzonitriles at various temperatures (1994)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 50 (1994), S. 363-373 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768193008523
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  • 4
    Electronic Resource
    Electronic Resource
    Crystal handling at low temperatures (1993)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 26 (1993), S. 615-619 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The cooling of a crystal in combination with the use of a protecting oil facilitates the handling and transfer to a diffractometer of even very sensitive material. The method is explained and the required device is described in this work. Basic advantages of the technique are simplicity and freedom of access to the sample without the need for sophisticated glassware. Therefore, this technique, suitable for crystal manipulation in the temperature range between room temperature and 193 K, is much more efficient than those involving the use of capillaries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889893002018
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  • 5
    Electronic Resource
    Electronic Resource
    Structure of (Rf)2(Cl)SnIV(μ2-O)SnIV(Cl)(Rf)2; Rf = 2,4,6-tris(trifluoromethyl)phenyl (1991)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 47 (1991), S. 2527-2529 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270191006352
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  • 6
    Electronic Resource
    Electronic Resource
    Fluorsilyl- und Fluorboryl-substituierte Cyclotetrasilazane Synthese und Kristallstrukturen (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 584 (1990), S. 87-104 
    Details
    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
    URL: http://dx.doi.org/10.1002/zaac.19905840107
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  • 7
    Electronic Resource
    Electronic Resource
    Cyclosilazane als Precursoren für Si3N4-Keramiken (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 596 (1991), S. 35-46 
    Details
    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
    URL: http://dx.doi.org/10.1002/zaac.19915960106
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  • 8
    Electronic Resource
    Electronic Resource
    Supermesityl-stabilisierte Iminoborane (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 608 (1992), S. 147-152 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926080222
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  • 9
    Electronic Resource
    Electronic Resource
    Zweifache Borylierung von Benzolderivaten mit (Diisoalkylamino)boradiyl-Einheiten (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 2461-2461 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911241116
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesen, Halogenaustausch-Reaktionen und Kristallstrukturen funktioneller Silylamine - M = Si, Ge, Sn; Hal = Cl, Br - (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 582 (1990), S. 151-161 
    Details
    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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905820119
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