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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Organometallics 14 (1995), S. 1085-1086 
    ISSN: 1520-6041
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 3050-3052 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird über eine sehr einfach und mit vorzüglicher Ausbeute auch bei großen Ansätzen gemäß \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm CrCl}_3 \, + \,{\rm Al}\, + \,6{\rm CO}\,\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{{\rm C}_6 {\rm H}_6 }^{{\rm AlCl}_3 }} \,{\rm Cr}({\rm CO})_6 \, + \,{\rm AlCl}_3 $$ \end{document}durchführbare Synthese von Chromhexacarbonyl im Autoklaven berichtet. Sie verläuft über die Zwischenstufe eines Aromatenkomplexes.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 93 (1960), S. 1156-1161 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei der Umsetzung der Metallhexacarbonyle mit N-Methylpyridiniumjodid in Dioxan entstehen gemäß(Me = Cr, Mo, W) oranges, diamagnetisches [CH3NC5H5] [Cr(CO)5J] sowie gelbes [CH3NC5H5][Mo(CO)5J] und [CH3NC5H5] [W(CO)5J]. Ersteres läß sich in sehr geringer Ausbeute durch Pyrolyse zu rotorangem, diamagnetischem, leicht flüchtigem C-Methylpyridin-chrom(0)-tricarbonyl als nunmehr echtem Aromaten-π-Komplex des Heterocyclus umsetzen.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 529-540 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: (1.4-Dimethyltetrazolium)carbonylferrates, Starting Products for (1.4-Dimethyltetrazolinylidene)- and Bis(methylamino)carbene ComplexesSodium hydrogen(tetracarbonyl)ferrate (4) reacts with 1.4-dimethyltetrazolium tetrafluoroborate (5) to yield a mixture of 1.4-dimethyltetrazolium carbonylferrates (6). These split off hydrogen and nitrogen under formation of (1.4-dimethyltetrazolinylidene)- (7) and [bis-(methylamino)carbene]tetracarbonyliron(0) (8). Structures and bonding properties of these new complexes are discussed by means of spectroscopic data, comparisons are made with (1.3-dimethylimidazolinylidene)tetracarbonyliron(0) (10) and N.N' -dimethylurea (9). The mechanisms of formation of 7 and 8 are discussed.
    Notes: Natrium-hydrogentetracarbonylferrat (4) reagiert mit 1.4-Dimethyl-tetrazolium-tetrafluoroborat (5) zu einem Gemisch von (1.4-Dimethyl-tetrazolium)-carbonylferraten (6). Diese spalten Wasserstoff und Stickstoff ab, wobei (1.4-Dimethyl-tetrazolinyliden)- (7) und [Bis-(methylamino)carben]-tetracarbonyl-eisen(0) (8) entstehen. Struktur und Bindungsverhältnisse dieser neuen Komplexe werden anhand spektroskopischer Daten diskutiert, Vergleiche mit (1.3-Dimethyl-imidazolinyliden)-tetracarbonyl-eisen(0) (10) und N.N' -Dimethyl-harnstoff (9) werden angestellt. Die Bildungsmechanismen von 7 und 8 werden diskutiert.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hindered Ligand Motions in Transition Metal Complexes, VIII. Investigations in Transition Metal Complexes with Cyclic Carbene Ligands, II. Chromium, Molybdenum, and Tungsten Complexes with 1,3-Dimethyl-4-imidazolin-ylidene LigandsPentacarbonyl(1,3-dimethyl-4-imidazolin-2-ylidene)chromium(0) (1), molybdenum(0) (2), and -tungsten(0) (3) disproportionate thermally to yield cis-tetracarbonylbis (1,3-dimethyl-4-imidazolin-2-ylidene)chromium(0) (4), -Molybdenum(0) (5) and -tungsten (0) (6) as well as the corresponding metal hexacarbonyls. 1 reacts in benzene with P(C6H5)3 and C6H11 NC to give cis-Cr(CO)4(C5H8N2) [P(C6H5)3] (7) and cis-Cr(CO)4 (C5H8N2) CNC6H11 (8), respectively. The 1H n. m. r. spectra of 4-6 are temperature-dependent resulting from a hindrance of the rotations of the cyclic carbene ligands around the carbene carbon-metal bonds. The hindrance is due to steric interactions between the N-methyl groups of the C5H8N2-ligands and the cis-standing ligands. The rotational barriers are about 9 kcal/mol and depend on the central metal. In contrast to this it was impossible to prove by n.m.r. spectroscopy a freezing of the rotations fo the carbene ligands in 7 and 8.
    Notes: Pentacarbonyl(1,3-dimethyl-4-imidazolin-2-yliden)chrom(0) (1), -molybdän(0) (2) und -wolfram(0) (3 disproportionieren thermisch zu cis-Tetracarbonylbis(1,3-dimethyl-4-imidazolin-2-yliden)-chrom(0) (4), -molybdän (0) (5) und -wolfram (0) (6) und den entsprechenden Metallhexacarbonylen. 1 reagiert in Benzol mit P(C6H5)3 bzw. C6H11 NC zu cis- Cr(CO)4H8N2)[P(C6H5)3] (7) bzw cis-Cr(CO)4(C5H8N2)(CNC6H11) (8). Die 1H-NMR-Spektren von 4-6 sind temperaturabhängig als Folge einer Hinderung der Rotation der cyclischen Carbenliganden um die Carbenkohlenstoff-Metall-Bindung. Die Hinderung ist auf sterische Wechselwirkungen zwischen den N-Methyl-gruppen der C5H8N2-Liganden und den dazu cis-ständigen Liganden zurückzuführen. Die Rotationsbarrieren liegen um 9kcal/mol und sind vom Zentralmetall abhängig. In 7 und 8 konnte dagegen das Einfrieren der Carbenligandrotation NMR-spektroskopisch nicht nachgewiesen werden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 95 (1962), S. 249-252 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch Umsetzung vom Cyclopentadienyl-molybdän-tricarbonyl-chlorid und Cyclopentadienyl-wolfram-tricarbonyl-chlorid mit Aluminiumchlorid bei 60 bis 70° und 240 at CO-Druck in Benzol gelang nach. \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm C}_5 {\rm H}_5 {\rm Me}^{{\rm II}} ({\rm CO})_3 {\rm Cl}\, + \,{\rm AlCl}_3 \, + \,{\rm CO}\, \to \,[{\rm C}_5 {\rm H}_5 {\rm Me}^{{\rm II}} ({\rm CO})_4]{\rm AlCl}_4 $$\end{document}die Darstellung von gelben, in Wasser nur kurzzeitig beständigen cyclopentadienyl-metall-tetracarbonyl-Kationen des Molybdäns und Wolframs. Sie wurden als Hexafluorophosphate isoliert und untersucht.  -  Mangan-pentacarbonyl-chlorid ließ sich mit Alcl3 bei 100° und 300 at CO-Druck in cyclohexan wie auch direkt in einer Trockenreaktion nach \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm Mn}^{\rm I} ({\rm CO})_5 {\rm Cl}\, + \,{\rm AlCl}_3 \, + \,{\rm CO}\, \to \,[{\rm Mn}^{\rm I} ({\rm CO})_6]{\rm AlCl}_4 $$\end{document} zu analysenreinem, farblosem Tetrachloroaluminat des bisher unbekannten Mangan(I)-hexacarbonyl-Kations umsetzen. Das Salz zersetzt sich selbst unter N2 in wenigen Tagen, Mit Waser wird augenblicklich CO2 freigesetzt, als Sekundärprodukt kann Mn2(CO)10 gefaßt werden. Dieses entsteht auch bei der thermischen Zersetzung von[Mn(CO)6]AlCl4.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 1795-1799 
    ISSN: 0009-2940
    Keywords: Carbonyl complexes ; Rhenium complexes ; Alkoxy carbene, structure of ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Metal Carbonyl Syntheses, XXI. - Straightforward Synthesis of a Synthetically Useful Alkoxy(carbonyl)metallateAnionic methoxy complexes are formed upon carbonylation of ammonium perrhenate in methanol at 230-240°C. Thus, the dinuclear ionic complex [N(CH3)4][Re2(CO)6(μ-OCH3)3] (2) results in 80% yield at CO pressures of ca. 100 bar, while the trinuclear derivative [N(CH3)4][Re3(CO)9(μ3-OCH3)3(μ3-OCH3)] (3) is due to lower pressure conditions (ca. 50 bar); 2 yields the bis(carbene) complex 4 of formula fac-Re(CO)3L2I upon treatment with a bis(imidazolium) iodide, thus demonstrating that carbonylrhenium chemistry not necessarily depends on the availability of Re2(CO)10.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0009-2940
    Keywords: Lanthanides ; Cyclopentadienyl ligand ; Neodymium complexes ; Dysprosium complexes ; Thulium complexes ; Thermochemistry ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Complexes of the Lanthanides, II[1]. - Tris(tert-butylcyclopentadienyl)neodymium, -dysprosium, and -thulium. Crystal and Molecular Structure of Bis(tert-butylcyclopentadienyl)hydroxidoneodymium and -dysprosiumNdCl3, DyCl3, and TmI3 (1a-c) react with the potassium salt K(tBuCp) (2) of tert-butylcyclopentadiene in THF to yield the sublimable homoleptic tris(tert-butylcyclopentadienyl) complexes of formula Ln(tBuCp)3 (3a-c). The thermal behavior makes these compounds potential precursors for chemical vapour deposition techniques (MOCVD).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 2573-2578 
    ISSN: 0009-2940
    Keywords: Chelate dicarbenes ; Indenone ; Cyclovoltammetry ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of a 2H-Inden-2-one Complex by Reduction of a Metal-Bound DicarbeneHerrn Professor Dr. Dr. h. c. mult. E. O. Fischer zum 75. Geburtstag gewidmet.Tetracarbonylchromium complexes with chelating o-phenylene-biscarbene ligands are reduced in two steps as shown by cyclic voltammetry. The first step corresponds to a reversible one-electron transfer, the second to an irreversible one-electron reduction followed by a rapid rearrangement of the biscarbene ligand into an η5-bound 2H-inden-2-one system by a twofold C-C coupling with one CO ligand. By reaction of tetracarbonyl[o-phenylenebis(methoxymethylene)]chromium (4) with sodium amalgam in acetonitrile the diamagnetic tricarbonyl(η5-1,3-dimethoxy-2-indenone)chromium dianion [6]2- is formed as the final reduction product. Its structure was determined by NMR and IR spectroscopy.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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