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  • Chemistry  (3)
  • 1985-1989  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Synthese und Eigenschaften von N,N-Dihalogen-1,1-difluoraminen R—CF2—NXX′ (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 4459-4472 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Properties of N,N-Dihalo-1,1-difluoroamines R—CF2—NXX′The nitriles X—CN (1a-4a, X = Cl, CF3, CCl3, CH3) react with chlorine and bromine to form N,N-dihalo-1,1-difluoroamines R—CF2—NX2 (R = F, CF3, CCl3, CH3; 1d-4d: X = Cl; 1e-4e: X = Br) in high yields. Routes are shown for the synthesis of bromochloroamines RCF2NBrCl (1g-4g), which could not be isolated in pure state. For the ethyl derivatives the imines R—CF = NX (2b-4b: X = Cl; 2c-4c: X = Br) were obtained in good yields by using the appropriate stoichiometry. Both thermolysis and photolysis of the amines give the diazenes (R—CF2—N=)2 (1f-4f).
    Notes: Aus der Umsetzung der Nitrile X—CN (1a-4a, X = Cl, CF3, CCl3, CH3) mit Chlor und Brom lassen sich die N,N-Dihalogen-1,1-difluoramine R—CF2—NX2 (R = F, CF3, CCl3, CH3; 1d-4d: X = Cl, 1e-4e: X = Br) in hohen Ausbeuten darstellen. Synthesewege zu den nicht in reiner Form isolierten Bromchloraminen RCF2NBrCl (1g-4g) werden aufgezeigt. Im Falle der Ethylverbindungen lassen sich durch Wahl der Stöchiometrie die Imine RCF = NX (2b-4b: X = Cl; 2c-4c: X = Br) erzeugen. Sowohl Thermolyse als auch Photolyse der Amine führt zu den Diazenen (R-CF2-N=)2 (1f-4f).
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851181117
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  • 2
    Electronic Resource
    Electronic Resource
    Fluor-Halogen-Austausch an 2,2,4,4-Tetrafluor-1,3-dithietan (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 4997-5005 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Fluorine-Halogen Exchange at 2,2,4,4-Tetrafluoro-1,3-dithietaneFrom the title compound C2F4S2 (2) and Lewis acids MF5 (M = As, Sb) stable 2,4,4-tri-fluoro-1,3-dithietan-2-ylium salts 6a, b are formed. Additions of halogen ions (Cl-, Br-, I-) to 6a, b yield the corresponding 2,2,4-trifluoro-4-halo-1,3-dithietanes 3, 8, and 9. The also stable 2-chloro-4,4-difluoro-1,3-dithietan-2-ylium salt C2ClF2S2+ SbF6- (7b) adds Cl- or Br- to form C2Cl2F2S2 (4) and C2BrClF2S2 (10), respectively. The 2-bromo-4,4-difluoro-1,3-dithietan-2-yl cation is the likely intermediate for the formation of C2Br2F2S2 (11).
    Notes: Aus der Titelverbindung C2F4S2 (2) können mit Lewis-Säuren MF5 (M = As, Sb) stabile 2,4,4-Trifluor-1,3-dithietan-2-ylium-Salze 6a, b erhalten werden. Durch Halogenid-Ionen-Addition (Cl-, Br-, I-) an 6a, b werden die entsprechenden 2,2,4-Trifluor-4-halogen-1,3-dithietane 3, 8, 9 dargestellt. Das ebenfalls stabile 2-Chlor-4,4-difluor-1,3-dithietan-2-ylium-Salz C2ClF2S2+ SbF6- (7b) führt durch Addition von Cl- und Br- zu den Verbindungen C2Cl2F2S2 (4) und C2BrClF2S2 (10). Das 2-Brom-4,4-difluor-1,3-dithietan-2-yl-Kation ist wahrscheinlich Zwischenprodukt bei der Bildung von C2Br2F2S2 (11).
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851181230
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  • 3
    Electronic Resource
    Electronic Resource
    Kristallstruktur von 2,4,4-Trifluor-1,3-dithietan-2-ylium-hexafluoroarsenat (1985)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 5006-5008 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Crystal Structure of 2,4,4-Trifluoro-1,3-dithietan-2-ylium HexafluoroarsenateCrystals of [F2CS2CF]⊕ [AsF6]⊖ are orthorhombic, space group Pmmn, with a = 764.9(1), b = 831.7(1), c = 690.3(1) pm. The cation possesses mm symmetry and does not show any short intermolecular interactions. The C—F and C—S bonds to the cationic carbon are significantly shorter than the other C—F and C—S bonds. The anion exhibits twofold disorder.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19851181231
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