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  • 1975-1979  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 3283-3293 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Substituted Ylides of Chromium, Molybdenum, and TungstenMetal-substituted ylides of the type X(CO)4CrC[P(CH3)3] R (2a-g) (R = CH3, CH2C6H5, C6H5, C6H4CH3-(4), C6H2(CH3)3-(2,4,6); X = Cl, Br, I) are formed by the reaction of trans-halogenotetracarbonyl(carbyne)chromium complexes 1a-g with trimethylphosphine at low temperatures. The reactions of the molybdenum and tungsten carbyne complexes 3d, 4d, e, h in addition lead to substitution of one CO-ligand by trimethylphosphine with formation of complexes of the type X(CO)3[P(CH3)3]MC[P(CH3)3]R (5d, 6d, e, h) (R = C6H4CH3-(4), Si(C6H5)3; X = Cl, Br; M = Mo, W). At higher temperatures 6e reacts with excess of phosphine to give Br(CO)2[P(CH3)3]2 WC[P(CH3)3]C6H4CH3-(4) (7e). The diamagnetic complexes, some of which are extremely thermolabile, were characterized by IR, 1H NMR, 13C NMR, and 31P NMR spectroscopy.
    Notes: Metallsubstituierte Ylide des Typs X(CO)4CrC[P(CH3)3]R (2a-g) (R = CH3, CH2C6H5, C6H5, C6H4CH3-(4), C6H2(CH3)3-(2,4,6); X = Cl, Br, I) bilden sich bei der Umsetzung von trans-Halogenotetracarbonyl(carbin)chrom-Komplexen 1a-g mit Trimethylphosphin bei tiefen Temperaturen. Molybdän- und Wolframcarbinkomplexe 3d, 4d, e, h substituieren bei gleichen Reaktionsbedingungen zusätzlich zur Ylidbildung einen Carbonylliganden durch Trimethylphosphin und führen zu Yliden der allgemeinen Form X(CO)3[P(CH3)3]MC[P(CH3)3]R (5d, 6d, e, h) (R = C6H4CH3-(4), Si(C6H5)3; X = Cl, Br; M = Mo, W). Mit überschüssigem Phosphin erfolgt bei 6e die nochmalige Umsetzung zu Br(CO)2[P(CH3)3]2 WC[P(CH3)3]C6H4CH3-(4) (7e). Die diamagnetischen, teilweise sehr thermolabilen Komplexe wurden IR-, 1H-NMR-, 13C-NMR- und 31P-NMR-spektroskopisch untersucht.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 1673-1683 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbyne Complexes, XI. Preparation and Spectra of trans-Tetracarbonylhalogeno(alkyl-or-phenylcarbyne) Complexes of Chromium and TungstenPentacarbonyl (methoxyorganylcarbene) chromium (0) and -tungsten(0) complexes react with boron trihalides BX3 (X - Cl, Br, I) by elimination of a methoxy group and one CO ligand and binding of a halogen atom in the trans position to give trans-tetracarbonylhalogeno (carbyne)-chromium and -tungsten. Spectroscopic data of these thermolabile compounds are reported.
    Notes: Pentacarbonyl (methoxyorganylcarben)chrom(0)-bzw.-wolfram (0)-Komplexe reagieren mit Bortrihalogeniden BX3 (X = Cl, Br, J) unter Abspaltung der Methoxygruppe sowie eines CO-Liganden und unter gleichzeitigem Einbau eines Halogenatoms zu trans-Tetracarbonylhalogeno-(carbin)chrom- bzw. - wolfram-Komplexen. Spektroskopische Daten der thermolabilen Verbindungen werden mitgeteilt.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 1651-1658 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbene Complexes, XCVIII. Pentacarbonyl(hydrogen halide)tungsten ComplexesAt low temperatures and in nonbasic solvents, pentacarbonyl(methoxyphenylcarbene)tungsten(0) (1) reacts with excess hydrogen halide HX (X = Cl, Br, I) by cleavage of the metal-carbene-C bond to form pentacarbonyl(hydrogen halide)tungsten complexes 2-5 The new compounds are strong acids; their constitution was clarified by i. r., 1H n. m. r., and 13C n. m. r. spectroscopic data.
    Notes: Pentacarbonyl(methoxyphenylcarben)wolfram(0) (1) reagiert in nichtbasischen Lösungsmitteln bei tiefen Temperaturen mit überschüssigem Halogenwasserstoff HX (X = Cl, Br, I) unter Spaltung der Metall-Carben-C-Bindung zu Pentacarbonyl(halogenwasserstoff)wolfram-Komplexen 2-5. Die neuen Verbindungen zeigen stark saure Eigenschaften; ihre Konstitutionsermittlung erfolgte anhand IR-, 1H-NMR- und 13C-NMR-spektroskopischer Befunde.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 3542-3551 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbyne Complexes, XL: trans-Halogeno-tetracarbonyl-dialkylaminocarbyne Complexes of Chromium and TungstenPentacarbonyl-alkoxy(dialkylamino)carbene complexes of tungsten (1a, b) and chromium (1c) react with the boron trihalides BCl3, BBr3, and BI3 by cleavage of the alkoxy group to yield the trans-halogeno-tetracarbonyl-dialkylaminocarbyne complexes 2-9. From the reaction of 1c with boron trifluoride the cationic carbyne complex 10 is obtained. The structures of the new complexes are derived from spectroscopic investigations. The structure of 8 is ensured by X-ray analysis.
    Notes: Pentacarbonyl-alkoxy(dialkylamino)carben-Komplexe des Wolframs (1a, b) und Chroms (1c) reagieren mit den Bortrihalogeniden BCl3, BBr3 und BI3 unter Abspaltung der Alkoxygruppe zu den trans-Halogeno-tetracarbonyl-dialkylaminocarbin-Komplexen 2-9. Die Umsetzung von 1c mit Bortrifluorid ergibt den kationischen Carbinkomplex 10. Die Strukturen der neuen Komplexe 2-10 werden aus spektroskopischen Untersuchungen abgeleitet. Der Aufbau von 8 ist durch eine Röntgenstrukturanalyse gesichert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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