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  • Articles  (24)
  • Inorganic Chemistry  (24)
  • Azaferrocene, tetramethyl-  (1)
  • Borane - Imidazol-2-ylidene adducts  (1)
  • 11
    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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  • 12
    Electronic Resource
    Electronic Resource
    Vinamidin-Chelate des Bors (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 1301-1306 
    Details
    ISSN: 0009-2940
    Keywords: 1,3,2-Diazaborinies, dihydro- ; Protonation ; Calculations, AMI, 4-31G ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Vinamidine Boron Chelate CompoundsThe chelate compound 7 is obtained by the reaction of the vinamidine 6 with Et2O - BF3. Protonation with HBF4 gives the cation 11. Comparison of the calculated and experimentally determined structures demonstrates 7 and 11 to be heterocyclic analogues of the cyclohexadienide 5 and 1,4-cy-cyclohexadiene (12).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230613
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  • 13
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    Heterocyclen als Liganden, XI. Octamethyl-1,1′-diazaferrocen als bifunktionelle Stickstoff-Base (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 997-1002 
    Details
    ISSN: 0009-2940
    Keywords: 1,1′-Diazaferrocene ; octamethyl ; adducts ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Heterocycles as Ligands, XI. - Octamethyl-1,1′-diazaferrocene as a Bifunctional Nitrogen Base(C4Me4N)2 Fe·2 HNC4Me4 (3) reacts with Brønstedt and Lewis acids to give the adducts [(C4Me4N·E)2Fe]n+ [4 - 6, 11 - 13; n=2, E=H, CH3, CH3C(O); n=O, E=BH3, BF3, Fe(CO)4]. The stepwise substitution of the tetramethylpyrrole molecules in 3 leads to the complexes [(C4Me4N·E)(C4Me4N·E')Fe]n+ [16, 17, 19; n - O, E=C4Me4NH, E'=Fe(CO)4; n=1, E=BH3, E'=H; n=2, E=H, E'=CH3]. Similarly, the complexes [{(C4Me4N)C(O)CH2CH2C(O)(NC4me4}Fe]Cl2 (9) and [Ag2{μMe4N)2Fe}2Fe}2](BF4)2·2 MeOH (15) are obtained. Reaction of [(C4Me4NH)2Fe](BF4)2 (4) with nBuLi gives the protonated diazaferrocene [(C4Me4NH)(C4Me4N)Fe]BF4 (18) from which the dimeric iron diamide {(C4Me4N)2Fe}2 (20) is obtained on further deprotonation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911240505
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  • 14
    Electronic Resource
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    Derivate des Imidazols, VI. Stabile Carben-Borane (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 2041-2045 
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    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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  • 15
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    Derivate des Imidazols, XVII. Synthese und Eigenschaften von Dichlor(1,3-dimethyl-2-imidazol-2-ylidenimino)-phosphan - ein Methylenamino-Substituent mit ungewöhnlichen DonoreigenschaftenHerrn Professor Kurt Dehnicke zum 65. Geburtstag gewidmet. (1996)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 479-482 
    Details
    ISSN: 0009-2940
    Keywords: Phosphanes ; Phosphazanes ; Methyleneamine ; Imidazoles ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Imidazole Derivatives, XVII. - Synthesis and Properties of Dichloro(1,3-dimethyl-2-imidazol-2-ylidenimino)phosphane - a Methylenamino Substituent with Uncommon Donor PropertiesDichloro(1,3-dimethyl-2-imidazol-2-ylidenimino)phosphane (5) is obtained from 1,3-dimethyl-2,3-dihydro-2-trimethylsilyliminoimidazole (4) and PCl3 in almost quantitative yield. Strong PN-π interaction (5B) is revealed by its X-ray structure analysis [P(1)-N(1) 1.579(2) Å]. AlCI3 causes chloride abstraction to give the cationic cyclophosphazane 8 identified by NMR spectroscopy.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19961290418
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  • 16
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    Metallorganische Verbindungen der Lanthanoide, 91[1] Carben-Addukte des zweiwertigen Samariums und Ytterbiums (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 2369-2372 
    Details
    ISSN: 0009-2940
    Keywords: Cyclopentadienyl complexes ; Carbene complexes ; Samarium(II) compounds ; Ytterbium(II) compounds ; Lanthanides, organo- ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Organometallic Compounds of the Lanthanides, 91[1]. - Carbene Complexes of Divalent Samarium and Ytterbium(Imidazol-2-ylidene)lanthanide adducts (C5Me4Et)2Sm-CN-(iPr)CMe=CMeN(iPr) (5b), (C5Me5)2Yb-CN(Me)CMe=CMeN(Me) (6a), (C5Me5)2Yb-CN(iPr)CMe=CMeN(iPr) (6b), and (C5H3tBu2)2Yb-CN(Me)CMe=CMeN(Me) (7a) are obtained from 1,3,4,5-tetramethyl-imidazol-2-ylidene (4a) or 1,4-diisopropyl-2,3-dimethylimidazol-2-ylidene (4b) and (C5Me4Et)2Sm(THF) (1), (C5Me5)2Yb(THF) (2), or (C5H3-tBu2)2Yb(THF) (3). The molecular structure of the ytterbium carbene complex 7a has been determined by X-ray diffraction.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19941271205
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  • 17
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    1,3,2-Diazaborinium-Verbindungen  -  neue Heteroaren-Kationen des Bors (1991)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 2197-2201 
    Details
    ISSN: 0009-2940
    Keywords: 1,3,2-Diazaborinium Compounds ; Calculations, AM1 ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1,3,2-Diazaborinium Compounds  -  New Cationic Boron HeteroarenesThe diazaborinium cation 9 is obtained by the reaction of the vinamidine boron chelate 8 with Et2O - BF3. The cyclic aluminium compound 13 forms with the dichloroboranes RBCl2 (R = Cl, Et, Ph) the cations 15,16a, and 16b. AM1 calculations demonstrate the π interaction of the boron with the nitrogen atoms as well as with the fluoro substituent.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19911241009
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  • 18
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    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 
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    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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  • 19
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    Derivate des Imidazols, XI. (C8H14N2)M(CO)5 (M = Mo, W) - Terminale Koordination eines Olefins in Pentacarbonylmetall-KomplexenHerrn Professor Reinhard Schmutzler zum 60. Geburtstag gewidmet. (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 1405-1407 
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    ISSN: 0009-2940
    Keywords: Imidazoles ; Pentacarbonyl metal complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Imidazole Derivatives, XI. - (C8H14N2)M(CO)5 (M = Mo, W) - Terminal Coordination of an Olefin in Pentacarbonyl Metal ComplexesHerrn Professor Reinhard Schmutzler zum 60. Geburtstag gewidmet.The 2-methylenimidazoline complexes (C8H14N2)M(CO)5 (M = Mo, W; 6) are obtained from M(CO)6 and 1,3,4,5-tetramethyl-2-methyleneimidazoline (5). Spectroscopic data reveal the strong donor character of the ylidic ligand in 6. The end-on coordination mode of the olefin is demonstrated by an X-ray structure analysis of 6a.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19941270814
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  • 20
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    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 
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    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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