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'Carbene' in keywords Facet   Publication Year 1999  [X]
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1999[X]
1Author    N. Orbert, K. Uhn, M. Anfred, Steim Ann, Gerd Weyers, HerrnRequires cookie*
 Title    Synthese und Eigenschaften von l,3-Diisopropyl-4,5-dimethylimidazolium- 2-car boxy lat. Ein stabiles Carben-Addukt des Kohlendioxids [1]  
 Abstract    The reaction of 2,3-dihydro-l,3-diisopropyl-4,5-dimethylimidazol-2-ylidene (5) with C 0 2 gives the imidazolium-2-carboxylate 6 . The compound can be transformed into the salts of its corresponding Broenstedt acid 8 . The cationic acid chloride 10a is obtained from 6 and thionyl chloride. Chemical properties and spectroscopic data indicate 6 to be less basic than its anionic counterparts, e. g. PhC02 . The X-ray structure of 
  Reference    Z. Naturforsch. 54b, 427—433 (1999); eingegangen am 27. November 1998 
  Published    1999 
  Keywords    Carbenes, Imidazoles, Carboxylic Acids, X-Ray Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0427.pdf 
 Identifier    ZNB-1999-54b-0427 
 Volume    54 
2Author    Norbert Kuhn, Manfred Steimann3, Gerd Weyers3, Gerald Henkelh, HerrnRequires cookie*
 Title    l,3-DHSopropyl-4,5-dimethylimidazolium-2-N,N'-diisopropylamidinat, ein neuartiges Retain [1] 1,3-Diisopropyl-4,5-dimethylimidazolium-2-N,N'-diisopropylamidinate, a Novel Betaine [1]  
 Abstract    The imidazolium-2-amidinate 6 is obtained from the reaction of 2,3-dihydro-1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene (4) with diisopropylcarbodiimide (5) as stable solid. Overcrow­ ding causes a lowered symmetry of the amidinate fragment indicated both by structural and NMR data. The strongly basic properties of 6 allow facile protonation with HC1 to the cationic amidine derivatives 7 and 8 . The ketoamidine 10 is formed by a ring opening reaction of 6 with water. I he X-ray structures of 6 and 10 are reported 
  Reference    Z. Naturforsch. 54b, 434—440 (1999); eingegangen am 21. Dezember 1998 
  Published    1999 
  Keywords    Amidines, Carbenes, Carbon Diimides, Imidazoles, X-Ray Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0434.pdf 
 Identifier    ZNB-1999-54b-0434 
 Volume    54 
3Author    Norbert Kuhn, Elke Niquet, Manfred Steimann, Isabel WalkerRequires cookie*
 Title    Methoxyalky 1-funktionalisierte 2,3-Dihy droimidazol-2-ylidene [ 1 ] Methoxyalkyl Functionalized 2,3-Dihydroimidazol-2-ylidenes [1]  
 Abstract    The 2,3-dihydro-l,3-di(methoxyalkyl)imidazol-2-ylidenes are obtained from the correspon­ ding cyclic thioureas and potassium. With CS2, the imidazolium dithiocarboxylates are formed. The results of X-ray structure determinations of two of these products are reported. 
  Reference    Z. Naturforsch. 54b, 1181—1187 (1999); eingegangen am 8. Juni 1999 
  Published    1999 
  Keywords    Carbenes, Imidazoles, Dithiocarboxylates, X-Ray Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1181.pdf 
 Identifier    ZNB-1999-54b-1181 
 Volume    54 
4Author    AnthonyJ. Arduengo, JensR. Iiia, Fredric Goerlicha, WilliamJ. Davidsonb, Marshall5Requires cookie*
 Title    Carbene Adducts of Dimethylcadmium  
 Abstract    The first examples of carbene-cadmium complexes are reported from the reactions of a variety of imidazol-2-ylidenes or imidazolin-2-ylidenes with dimethylcadmium. Four new carbene complexes are characterized by NMR spectroscopy ('H , i?C and 1 n Cd). The cadmium centers are strongly shifted downfield (100 -1 5 0 ppm) by interaction with the carbenes. X-ray structures are reported for three carbene-cadmium 1:1 adducts. The cadmium centers exhibit distorted trigonal-planar geometries in which the carbene ligands have an average 18.2 pm longer bond distance to cadmium compared to the methyl groups. The planes of cadmium coordination are twisted with respect to the plane of the imidazole ring. The more basic imidazolin-2-ylidene is shown to displace imidazol-2-ylidenes from the cadmium center. 
  Reference    Z. Naturforsch. 54b, 1350—1356 (1999); received June 16 1999 
  Published    1999 
  Keywords    Carbene, Cadmium, Ylide, Carbene Complex, Imidazol-2-ylidene 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1350.pdf 
 Identifier    ZNB-1999-54b-1350 
 Volume    54