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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 108 (1977), S. 1019-1025 
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Oxozirconium(IV) alkoxides of the type ZrO(OR)2·ROH and ZrOCl(OR)·2 ROH, where R is methyl, ethyl, and isopropyl, and ZrO(OCMe 3)2·0.5Me 3COH and ZrOCl(OCMe 3)·1.5Me 3COH have been prepared by the reaction of dichloroxozirconium(IV)-2-acetic acid with corresponding alcohols in the presence of appropriate amounts of piperidine. The alkoxides have been isolated and characterised through infrared, thermal and conductance studies.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 106 (1975), S. 1375-1380 
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The Schiff base salicylideneamino-o-methylthiobenzene (I), CH3S−C6H4−N=CH−C6H4−OH (SMeNOH), has been synthesized and its complexes of the type CuX(SMeNO) whereX=Cl, Br, NO3, CNS, and ClO4, CuX′(SMeNOH) whereX′=SO4 and (BF4)2, NiX″ 2(SMeNOH) whereX″=Cl and Br, NiNO3(SMeNO) andM(SMeNO) 2 whereM=Cu, Ni and Co, have been prepared and characterised through infrared, magnetic moment and conductance measurements.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 2886-2899 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Partially Substituted Tetrazenes (Me3E)nN4H4 - n (E = Si, Ge, Sn): Preparation, Characterization, and Thermolysis1)Partially substituted tetrazenes (Me3E)nN4H4 - n (E = Si, Ge, Sn) can be prepared by protolysis of higher substituted tetrazenes (Me3E)oN4H4 - o (O 〉 n) or by silylation, germylation, or stannylation of lower substituted tetrazenes (Me3E)mN4H4 - m (m 〈 n). The obtained tetrazenes (Tab. 1) are colorless compounds; they have 2-tetrazene constitution, and trans-tetrazene configuration. The tetrazene (Me3Si)2N  -  N = N  -  NHX (X = H or GeMe3) isomerize by heating in dilute solution into (Me3Si)XN  -  N = N  -  NH(SiMe3). The thermolysis of (Me3Si)2N  -  N = N  -  NH(SiMe3) leads mainly to Me3SiN3 and (Me3Si)2NH (t140°C1/2140°C = 3/4 h), of (Me3Si)2N  -  N = NH2 to Me3SiN3 and Me3SiNH2 (concentrated solution; t140°C1/240°C ca. 1/4 h), and of (Me3Si)HN  -  N = N  -  NH(SiMe3) to N2 and (Me3Si)2N  -  NH2 (dilute solution; t140°C1/2140°C 〉 1 h) or to NH3 and (Me3Si)2NH (concentrated solution; t140°C1/2 〈 1 h).
    Notes: Teilsubstituierte Tetrazene (Me3E)nN4H4 - n (E = Si, Ge, Sn) können durch Protolyse höher substituierter Tetrazene (Me3E)oN4H4 - o (O 〉 n) oder durch Silylierung, Germylierung bzw. Stannylierung niedriger substituierter Tetrazene (Me3E)mN4H4 - m (m 〈 n) dargestellt werden. Die gewonnenen Tetrazene (Tab 1) sind farblose Verbindungen: sie haben 2-Tetrazen-Konstitution und trans-Tetrazen-Konfiguration. Die Tetrazene (Me3Si)2N  -  N = N  -  NHX (X = H oder GeMe3) isomerisieren sich in verdünnter Lösung beim Erhitzen in (Me3Si)XN  -  N = N  -  NH(SiMe3). Die Haupttermolyse von (Me3Si)2N  -  N = N  -  NH(SiMe3) führt zu Me3SiN3 und (Me3Si)2NH (t140°C1/2140°C = 3/4 h), von (Me3Si)2 (Me3Si)2N  -  N = NH2 zu Me3SiN3 und Me3SiNH2 (konzentrierte Lösung; t140°C1/240°C ca. 1/4 h) und von (Me3Si)HN  -  N = N  -  NH(SiMe3) zu N2 und (Me3Si)2N  -  NH2 (verdünnte Lösung; t140°C1/2140°C 〉 1 h) oder zu NH3t140°C und (Me3Si)2NH (Konzentrierte Lösung; t140°C1/2140°C 〈 1 h).
    Additional Material: 3 Tab.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 710-722 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Derivatives of Hydrazine, 51) Preparation and Some Properties of Trimethylsilylated, -germylated, and -stannylated TosylhydrazinesWith the exception of TosN2H(SnMe3)2, all tosylhydrazines TosN2Hm(E′Me3)n(E″Me3)0-(E‴Me3)p(E′, E″, E‴= So, Ge, Sn; m + n + o + p = 3) have been synthesized and characterized. These were prepared mostly by silylation, germylation, or stannylation of tosylhydrazine, TosN2H3, with chlorides Me3ECl or amines Me3ENR2, and, in a few cases, by tosylation of hydrazines N2H2(EMe3)2 and N2H2(EMe3)3 with tosyl chloride. Amines Me3ENR2 react with these newly synthesized tosylhydrazines by an exchange of hydrogen or of E′Me3 for EMe3. The hydrazides TosN2Li(SiMe3)(EMe3), obtained by the reaction of LiN(SiMe3)2 with TosN2Li(SiMe3)(EMe3) (E=Si, Ge) decompose on heating into TosLi and the azo-compounds Me3Si—N=N—EMe3.
    Notes: Mit Ausnahme von TosN2H(SnMe3)2 konnten alle Tosylhydrazine TosN2Hm(E′Me3)n(E″Me3)0-(E‴Me3)p(E′, E″, E‴=Si, Ge, Sn; m + n + o + p = 3) synthetisiert und charakterisiert werden. Ihre Darstellung erfolgte in den meisten Fällen durch Silylierung, Germylierung oder Stannylierung von Tosylhydrazin, TosN2H3, mit Chloriden Me3 ECl oder Aminen Me3ENR2, in einigen Fällen durch Tosylierung von Hydrazinen N2H2(EMe3)2 und N2H(EMe3)3 mit Tosylchlorid. Amine Me3ENR2 reagieren mit den neu dargestellten Verbindungen unter Austausch sowohl von Wasserstoff als auch von E′Me3 gegen EMe3. Die aus TosN2H)SiMe3)(EMe3) (E=Si, Ge) mittels LiN(SiMe3)2 erhältlichen Hydrazide TosN2Li(SiMe3)(EMe3) liefern bei höheren Temperaturen unter TosLi-Abspaltung die Azoverbindungen Me3Si—N=N—EMe3.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 2718-2729 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tetrasubstituted Tetrazenes (Me3E)2N—N = N—N(EMe3)2 (E = Si, Ge, Sn): Preparation, Characterization, and DecompositionTetrakis(trimethylsilyl)tetrazene (1) is formed in almost quantitative yield by the catalytic dimerization of bis(trimethylsilyl)diazene with silicon tetrafluoride. The tetrazene N4H4, obtained as a result of protolysis of 1 with trifluoroacetic acid, is converted quantitatively into tetrakis-(trimethylgermyl)tetrazene (2) and tetrakis(trimethylstannyl)tetrazene (3) by Me3ENR2 (E = Ge, Sn). The colourless, crystalline tetrazenes 1-3 have 2-tetrazene constitution, trans-configuration and planar conformation of E4N4-skeleton. The thermolysis of the tetrazenes above 100-150°C occurs under nitrogen evolution mainly into (Me3Si)2NH for 1, (Me3Ge)4N2 for 2, and a mixture of (Me3Sn)3N and (Me3Sn)2 for 3. The tetrazenes 1 and 2 photolyse easily to (Me3E)3N and Me3EN3, whereas 3 reacts by photolysis to form (Me3Sn)3N, (Me3Sn)2, and N2.
    Notes: Tetrakis(trimethylsilyl)tetrazen (1) entsteht in fast quantitativer Ausbeute durch katalytische Dimerisierung von Bis(trimethylsilyl)diazen mit Siliciumtetrafluorid. Das aus 1 durch Protolyse mit Trifluoressigsäure erhältliche Tetrazen N4H4 läßt sich mittels Me3ENR2 (E = Ge, Sn) quantitativ in Tetrakis(trimethylgermyl)tetrazen (2) sowie Tetrakis(trimethylstannyl)tetrazen (3) umwandeln. Die farblosen, kristallisierten Tetrazene 1-3 haben 2-Tetrazen-Konstitution, trans-Konfiguration sowie planare Konformation des E4N4-Gerüsts. Die Thermolyse der Tetrazene oberhalb von 100-150°C führt unter Stickstoffentwicklung hauptsächlich zu (Me3Si)2NH im Falle von 1, (Me3Ge)4N2 im Falle von 2 sowie einem Gemisch von (Me3Sn)3N und (Me3Sn)2 im Falle von 3. Die Tetrazene 1 und 2 photolysieren rasch in (Me3E)3N und Me3EN3, während 3 photolytisch in (Me3Sn)3N, (Me3Sn)2 und N2 übergeht.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 2916-2927 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tetrasubstituted Tetrazenes (Me3E)2N—N=N—N(EMe3)2 (E=Si, Ge, Sn): ReactivityBy Substitution of the silyl, germyl, or stannyl groups, (Me3Si)2N—N=N—N(SiMe3)2 (1) reacts with variable amounts of trifluoroacetic acid to form (Me3Si)4-nN4Hn, (Me3Ge)2N—N=N—N(GeMe)2 (2) with variable amounts of methanol to form (Me3Ge)4-nN4Hn, and (Me3Sn)2N—N=N—N(SnMe3)2 (3) with variable amounts of trimethylchlorosilane to give (Me3Sn)4-nN4(SiMe3)n (n = 1-4). The reaction of 1 with benzenesulfonyl isocyanate leads by substitution and cyclization to silylated 5-hydroxytetrazole 12. Substitution in connection with thermolysis of the substitution products formed is found in the reaction of 1 with methanol, aluminium chloride, or nitrosyl chloride and in the reaction of 3 with trimethylstannane, acetone, or nitrosobenzene. By oxidation of 1 with chlorine, bromine, or p-benzoquinone and of 3 with p-benzoquinone or oxygen, all tetrazene nitrogen is evolved. The reduction of 1 with hydrogen or alkali metals leads to nitrogen and (Me3Si)2NH or (Me3Si)2NM.
    Notes: Unter Substitution der Silyl-, Germyl- bzw. Stannylgruppen reagieren (Me3Si)2 N—N=N—N-(SiMe3)2 (1) mit variablen Mengen Trifluoressigsäure zu (Me3Si)4-nN4Hn, (Me3Ge)2 N—N=N—N-(GeMe3)2 (2) mit variablen Mengen Methanol zu (Me3Ge)4-nN4Hn und (Me3Sn)2 N—N=N—N-(SnMe3)2 (3) mit variablen Mengen Trimethylchlorsilan zu (Me3Sn)4-nN4 (SiMe3)n (n = 1-4). Die Reaktion von 1 mit Benzolsulfonylisocyanat führt unter Substitution und Cyclisierung zu einem silylierten 5-Hydroxytetrazol 12. Substitution, verbunden mit einer Thermolyse des gebildeten Substitutionsproduktes, wird im Falle der Umsetzung von 1 mit Methanol, Aluminiumchlorid und Nitrosylchlorid bzw. von 3 mit Trimethylstannan, Aceton und Nitrosobenzol beobachtet. Durch Oxidation von 1 mit Chlor, Brom und p-Benzochinon bzw. von 3 mit p-Benzochinon und Sauerstoff wird der gesamte Tetrazenstickstoff freigesetzt. Die Reduktion von 1 mit Wasserstoff bzw. Alkalimetallen M führt zu Stickstoff sowie (Me3Si)2NH bzw. (Me3Si)2NM.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 2658-2660 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Preparation of Silylated Lithium TetrazenidesReaction of butyllithium with tris- or bis(trimethylsilyl)tetrazene, (Me3Si)3N4H or (Me3Si)2N4H2, lead to tetrazenides 1-3 which are sensitive in hydrolysis and thermolysis as well as against oxygen. Reactions (1)-(6) refer to their modes of thermolysis.
    Additional Material: 1 Tab.
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  • 8
    ISSN: 1434-1948
    Keywords: Double Bonds ; NMR Spectroscopy ; Silicon ; Tin ; X-ray structure analyses ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The dark blue, air- and moisture-sensitive, thermolabile tristannaallene R*2Sn=Sn=SnR*2 (5) (R* = SitBu3) is prepared by reaction of Sn(OtBu)2 or Sn[N(SiMe3)2]2 with R*Na in pentane/benzene at -25°C. The dark red-brown, air-sensitive, moisture-insensitive, and thermostable cyclotri-stannene R*4Sn3 (6) with a -R*Sn=SnR*- moiety as part of a Sn3 ring is obtained from the reaction of Sn(OtBu)2 or Sn[N(SiMe3)2]2 with R*Na in pentane at 25°C or from the isomerization of 5 at room temperature (τ1/2 = 9.8 h). According to the result of X-ray structural analyses the Sn3 framework of chiral 5 is bent (156°) and the terminal Sn atoms have pyramidal surroundings. The SnSn double bonds in 5 (2.68 Å) are shorter than those found for the hitherto structurally investigated distannenes (2.77-2.91 Å). Even shorter is the double bond in 6 (2.59 Å). The unsaturated Sn atoms here have nearly planar surroundings in perfect analogy to the carbon atoms in CC double bonds. The SnSn double bond in 6 can therefore be considered as the first “true” Sn=Sn bond. The structures of 5 and 6 can be deduced also from 119Sn- and 29Si-NMR studies in solution.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 88 (1976), S. 257-258 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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