| | 1 | Author
| Norbert Kuhn3, Joanna Fahl3, Roland Boeseb, Gerald Henkelc | Requires 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 | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/53/ZNB-1998-53b-0881.pdf | | | | Identifier
| ZNB-1998-53b-0881 | | | | Volume
| 53 | |
| 2 | Author
| Hiroshi Miyoshi, Keizo Horiuchi, Narumi Sakagami, Kenichi Okamoto, Ryuichi Ikeda | Requires cookie* | | | Title
| C1 NQR, *H NMR, and X-Ray Diffraction Studies in a Hydrogen Bonded Complex Na 2 PtCl 6 * 6H z O | | | | Abstract
| The 35 C1 NQR frequencies, spin-lattice relaxation time and X H NMR relaxation time were measured on crystalline Na 2 PtCl 6 • 6H z O at 77-350 K. The presence of three nonequivalent chlo-rine sites found by X-ray diffraction measurement is in agreement with the observed three NQR lines, which have different temperature dependences attributable to differences in the direction of H-bonding with water molecules. The three NQR lines correspond to three kinds of chlorines with different Pt-Cl distances and H-bond directions. | | | |
Reference
| Z. Naturforsch. 53a, 603—607 (1998); received October 31 1997 | | | |
Published
| 1998 | | | |
Keywords
| CI NQR, X-Ray Diffraction, Spin-Lattice Relaxation, Quadrupole Coupling Constant, Hydrogen Bond | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_A/53/ZNA-1998-53a-0603.pdf | | | | Identifier
| ZNA-1998-53a-0603 | | | | Volume
| 53 | |
|
