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  • Articles  (4)
  • Carbenes  (2)
  • Azaferrocene, tetramethyl-  (1)
  • Borane - Imidazol-2-ylidene adducts  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Heterocyclen als Liganden, V: Synthese und Charakterisierung von 2,3,4,5-Tetramethyl-1-azaferrocen (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 1891-1896 
    Details
    ISSN: 0009-2940
    Keywords: Azaferrocene, tetramethyl- ; Trihydropyrrolylboranate coordination ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Heterocycles as Ligands, V.  -  Synthesis and Characterization of 2,3,4,5-Tetramethyl-l-azaferroceneC5H5Fe(C4Me4N) (7) is obtained by deprotonation of the pyrrole complex [C5H5Fe(C4Me4NH)]BF4 (6). The nitrogen basicity of 7 resembles closely that of alkylpyridines (pKa = 7.2). Complex 7 reacts with Lewis acids to give the adducts [C5H5Fe(C4Me4NR)]+ [8, 9; R = CH3, C(O)CH3] and C5H5Fe(C4Me4NE) [10, 11; E = BH3, Fe(CO)4]. The X-ray structure of the pyrrolyltrihydroborate complex 10 is isosteric with pentamethylferrocene and has a metallocene structure with an eclipsed ligand conformation.
    Notes: Die Synthese von C5H5Fe(C4Me4N) (7) gelingt durch Deprotonierung des Pyrrol-Komplexes [C5H5Fe(C4Me4NH)]BF4 (6). Komplex 7 entspricht in seiner Stickstoff-Basizität den Alkylpyridinen (pKs = 7.2). Durch Umsetzung mit Lewis-Säuren werden die Addukte [C5H5Fe(C4Me4NR)]+ [8, 9; R = CH3, C(O)CH3] und C5H5Fe(C4Me4NE) [10, 11; E = BH3, Fe(CO)4] erhalten. Nach der Kristallstrukturanalyse ist der zu Pentamethylferrocen isostere Pyrrolyltrihydroborat-Komplex 10 ein Metallocen mit ekliptisch angeordneten Ringliganden.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891221010
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  • 2
    Electronic Resource
    Electronic Resource
    Derivate des Imidazols, VI. Stabile Carben-Borane (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 2041-2045 
    Details
    ISSN: 0009-2940
    Keywords: Imidazol-2-ylidene - Borane adducts ; Calculations, ab initio ; Borane - Imidazol-2-ylidene adducts ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Imidazole Derivatives, VI[1].  -  Stable Carbene BoranesStable imidazol-2-ylidene - borane adducts 8 and 9 are obtained from 1,3,4,5-tetraalkylimidazol-2-ylidenes 7 and Me2S BH3 or Et2O BF3. An X-ray structure analysis of 8b has been performed. An ab initio calculation [MP2(fu)/6-31G**] reveals a low energy difference between two rotamers. The bond orders of the cyclic bonds imply only a minor interaction between the N - C - N and the C - C fragment.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260913
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  • 3
    Electronic Resource
    Electronic Resource
    Derivate des Imidazols, XIII. Carben-Komplexe des Siliciums und ZinnsHerrn Professor Peter Paetzold zum 60. Geburtstag gewidmet. (1995)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 128 (1995), S. 245-250 
    Details
    ISSN: 0009-2940
    Keywords: Carbenes ; Organosilicon compounds ; Organotin compounds ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Imidazole Derivatives, XIII. - Carbene Complexes of Silicon and TinHerrn Professor Peter Paetzold zum 60. Geburtstag gewidmet.Stable adducts of the composition L · SiCl4 (2), L · SiR2Cl2 (3,4), and L · SnR2Cl2 (6) are formed by the reaction of the imidazol-2-ylidenes L (1) with the corresponding silicon and tin halides. For L = SiCl4 (2b; L = 1,3-diethyl-4,5-dimethylimidazol-2-ylidene) and L · SnPh2Cl2 (6c; L = 1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene) the monomeric nature of the compounds containing pentacoordinated silicon and tin is established by X-ray structure analyses. The reaction of 1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene (1c) with SnCl2 leads to the formation of the monomeric stannylene complex L · SnCl2 (7c; L = 1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene) whose molecular geometry indicates a week carbon-to-tin donor bond [Sn—C(1) 2.290(5) Å].
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19951280307
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  • 4
    Electronic Resource
    Electronic Resource
    Derivate des Imidazols, XIXPart XVIII: Ref.[1]. Koordination oder Reduktion? Zur Reaktion von 1,3-Diisopropyl-4,5-dimethylimidazol-2-yliden mit Schwefelhalogeniden und SchwefeloxidhalogenidenHerrn Professor Max Herberhold zum 60. Geburtstag gewidmet. (1996)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 1579-1586 
    Details
    ISSN: 0009-2940
    Keywords: Imidazoles ; Carbenes ; Sulfur Compounds ; Fluorine Compounds ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Imidazole Derivatives, XIXPart XVIII: Ref.[1] .  -  Coordination or reduction? On the Reaction of 1,3-Diisopropyl-4,5-dimethylimidazol-2-ylidene with Sulfur Halides and Sulfur Oxygen Halides Herrn Professor Max Herberhold zum 60. Geburtstag gewidmet.The reaction of 1,3-diisopropyl-4,5-dimethylimidazol-2-ylidene (4, Im) with sulfur halides and sulfur oxygen halides may be described as a coordination (1) or reduction (2) process in respect to the sulfur centre. With SCl2 and SOCl2 the hypervalent sulfur compounds Im · SCl2 (5) and Im · S(O)Cl2 (13) are obtained. The SF2 adduct Im · SF2 (11) is formed on treatment of 5 with AgF. 13 is alkylated by methyl iodide to give the Im · S(Me)OCl2 cation (15). Surprisingly, reduction of the sulfur centre (2) occurs on treatment of 4 with SF4 to form the ImF+SF3- salt 18 containing the new SF3 anion. As expected, the same type of reaction occurs with the sulfuryl halides SO2ClF and SO2F2 to give the fluorosulfites ImCl+-SO2F- (21) and ImF+SO2F- (23). The X-ray structures of 5, 13 and 23 are reported.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19961291228
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