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'Carbene' in keywords Facet   Publication Year 1998  [X]
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1Author    Norbert Kuhn, Joanna Fahl, Riad Fawzi, Cäcilia Maichle-Mößmer, Manfred SteimannRequires cookie*
 Title    Stable Carbene Adducts of Chlorine [1]  
 Abstract    The carbene adducts 3a-c (R 1 = Me, Et, iso-Pr; R2 = Me) are formed from the 2,3-dihydro-imidazol-2-ylidenes la-c and 1,2-dichloroethane as air-sensitive solids in good yields. The compounds exhibit a reactive Cl-Cl bond. Benzene is chlorinated by 3a,b to give chlorobenzene and the imidazolium salts 10a,b under mild conditions. 3c acts as a chloride donor to give with AICI3 and S 0 2 the 2-chloroimidazolium salts 12c andl3c (X = A1C14, S 0 2C1). On hydrolysis, the less reactive hydrate salt 14c is formed from 3c. The X-ray structures of 10a and 14c are reported. 
  Reference    Z. Naturforsch. 53b, 720—726 (1998); eingegangen am 23. Februar 1998 
  Published    1998 
  Keywords    Carbene, Chlorine, X-Ray Data 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0720.pdf 
 Identifier    ZNB-1998-53b-0720 
 Volume    53 
2Author    Norbert Kuhn3, Joanna Fahl3, Roland Boeseb, Gerald HenkelcRequires cookie*
 Title    Zur Reaktion von 2,3-Dihydroimidazol-2-ylidenen mit Pentafluorpyridin: Carbene als Reaktionspartner in der nucleophilen aromatischen Substitution [1] On the Reaction of 2,3-Dihydroimidazol-2-ylidenes with Pentafluoropyridine: Carbenes as Reactants in Nucleophilic Aromatic Substitution [1]  
 Abstract    The 2,3-dihydro-l,3,4,5-tetraalkylimidazol-2-ylidenes 3 (R = Me, i'so-Pr) react immediately with pentafluoropyridine to form the 2-tetrafluoropyridylimidazolium salts 4 in good yields. In contrast with the tetramethyl derivative 4a, alkyl fluoride is eliminated from the isopropyl salt 4b to give 1 -isopropyl-4,5-dimethyl-2-tetrafluoropyridylimidazole, which dimerises via hydrogen bridges in the solid state (7). The X-ray structures of l,3-diisopropyl-4,5-dimethyl-2-tetrafluoropyridylimidazolium chloride (5) and 7 are reported. 
  Reference    Z. Naturforsch. 53b, 881—886 (1998); eingegangen am 9. April 1998 
  Published    1998 
  Keywords    Carbenes, Imidazoles, Pyridines, Nucleophilic Aromatic Substitution, Hydrogen Bonds 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0881.pdf 
 Identifier    ZNB-1998-53b-0881 
 Volume    53