ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Inorganic Chemistry  (4)
  • Metallacyclic systems  (1)
Collection
Keywords
Publisher
Years
  • 1
    Electronic Resource
    Electronic Resource
    Reaktionen von 1,2,4-Thiadiazol-3,5-dicarbonitril und Röntgenstrukturanalyse von 3-Cyan-1,2,4-thiadiazol-5-carboximidsäure-methylester (1984)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 2681-2685 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of 1,2,4-Thiadiazole-3,5-dicarbonitrile and X-ray Crystal Structure Analysis of Methyl 3-Cyano-1,2,4-thiadiazole-5-carboximidateFrom 1,2,4-thiadiazole-3,5-dicarbonitrile (1) the imidic esters 2, 4, the thioamides 3, 6, and the dicarboxamide 5 are obtained using the different reactivity of both nitrile groups of 1 against nucleophilic reagents. The first attack occurs at the nitrile group adjacent to sulfur, as is shown by X-ray structure analysis of 2.
    Notes: Aus 1,2,4-Thiadiazol-3,5-dicarbonitril (1) werden die Imidsäureester 2, 4, die Thioamide 3, 6 und das Dicarboxamid 5 erhalten. Dabei wird die unterschiedliche Reaktivität der beiden Nitrilgruppen von 1 gegenüber nucleophilen Reagenzien ausgenutzt. Zuerst erfolgt der Angriff an der Nitrilgruppe in Nachbarstellung zum Schwefel; dies wird durch die Röntgenstrukturanalyse von 2 bestätigt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19841170811
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Reaktionen von Hexafluoraceton mit Alkalicyanaten (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 2659-2670 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of Hexafluoroacetone with Alkali CyanatesNaSCN and KOCN react with hexafluoroacetone (HFA) in a molar ratio of 1:2 in a one-step reaction to yield the hexafluoropropanimine derivatives (CF3)2C=NC(CF3)2OM (2a, b) (M=Na, K). (CF3)2C=N- is a possible intermediate. Hydrolysis of 2a in aqueous tetraphenylphosphonium chloride solution yields a crystalline hydrate of composition [(CF3)2C(OH)2·(CF3)2C(O)OH]- Ph4P+ (3). In the solid state dimeric dianions are observed, which are connected via four asymmetrical and two symmetrical O⃛H⃛O bonds. Starting with a 1:1 KSCN/HFA stoichiometry the polycyclic bisspiro compound 5 is formed in a complex reaction. In the reaction of potassium selenocyanate with HFA the C-Se bond is cleaved and the CF3-substituted oxazolidine 6 is formed. The X-ray structure analyses of 2a, 3, 5 and 6 are reported.
    Notes: NaSCN und KOCN reagieren mit Hexafluoraceton (HFA) im Molverhältnis 1:2 unter Abbau des Anions in einem Schritt zu den Hexafluorpropanimin-Derivaten (CF3)2C=NC(CF3)2OM (2a, b) (M=Na, K), wahrscheinlich über (CF3)2C=N- als Zwischenstufe. Die Hydrolyse von 2a in Gegenwart wäßriger Tetraphenylphosphoniumchlorid-Lösung ergibt ein kristallines Hydrat der Zusammensetzung[(CF3)2C(OH)2·(CF3)2C(O)OH]- Ph4P+ (3). Im Kristall liegen dimere Dianionen vor, die über vier asymmetrische und zwei symmetrische Wasserstoff-Brückenbindungen verknüpft sind. In einer unübersichtlichen Reaktion entsteht bei einem Reaktandenverhältnis KSCN/HFA von 1:1 die polycylische Bisspiroverbindung 5. Kaliumselenocyanat reagiert mit HFA unter C - Se-Bindungsspaltung und nachfolgender Bildung des CF3-substituierten Oxazolidins 6. Die Röntgenstrukturanalysen von 2a, 3, 5 und 6 werden mitgeteilt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851180709
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Synthesen und Strukturen von cyclischen und acyclischen Vanadium(V)- und Molbydän(VI)-haltigen Verbindungen (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 2655-2661 
    Details
    ISSN: 0009-2940
    Keywords: Metallacyclic systems ; Vanadium ; Molybdenum ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Syntheses and Structures of Cyclic and Acyclic Compounds Containing Vanadium(V) and Molybdenum(VI)The reaction of (C2F5)2P(Cl)=NSiMe3 (2) with Cl3V=NSiMe3 in CH2Cl2 yields the eight-membered ring [(C2F5)2PN2VCl2]2 (3). (CF3)2P(Cl)=NSiMe3 (1) reacts with VOCl3 to form the eight-membered ring [(CF3)2PN]3NVCl2 (4). A six-membered ring [Ph2PN]2NVCl2 (5) can be isolated from the reaction of Ph2P(Cl)=NSiMe3 with VOCl3. 1 reacts quantitatively with MoO2Cl2 and MoOCl4 to form [MoOCl3-O-P(CF3)2=N-SiMe3]4 (6) and (CF3)2P(Cl)=N-MoOCl3 (7), respectively. The molecular structures of 3, 5, and 6 have been determined by X-ray diffraction.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911241204
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Additionsreaktionen von 1,1-Dicyan-2,2-bis(trifluormethyl)ethen (1986)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 119 (1986), S. 3150-3157 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Addition Reactions of 1,1-Dicyano-2,2-bis(trifluoromethyl)etheneBy the reaction of the title compound (CF3)2C=C(CN)2 with PCl5 the (phosphoranyliden-amino)ethene 1 is obtained. The phosphorane 1 reacts with Me3SiNMe2 to form 2. WCl6 and MoCl5 react with (CF3)2C=C(CN)2 to give the acyclic nitrenes 3 and 4. The X-ray structure analysis of 3a, an acetonitrile adduct of 3, is reported.
    Notes: Die Titelverbindung (CF3)2C=C(CN)2 reagiert mit PCl5 zu dem (Phosphoranylidenamino)-ethen 1. Daraus entsteht 2 durch Reaktion mit Me3SiNMe2. Umsetzungen von (CF3)2C=C(CN)2 mit WCl6 und MoCl5 ergeben die acyclischen Nitrenkomplexe 3 und 4. Von 3a, einem Acetonitriladdukt von 3, wird eine Röntgenstrukturanalyse mitgeteilt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19861191022
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...