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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 657-672 
    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, LXVIII. Synthesis of cis- and trans-Tetracarbonyl(carbene)(phosphine) Complexes of Chromium(0) and Tungsten(0)Thermal reaction in the range 60 to 80°C and photochemical reaction at room temperature of tertiary phosphines PX3 [X3=(CH3)3, (C2H5)3, (n-C8H17)3, (i-c3H7)3, (C6H11)3, (C2H5)2C6H5, (C6H5)2 C2H5, (C6H5)3, (p-C6H4CH3)3, (p-C6H4F)3, (m-C6H4F)3] with pentacarbony(carbene) complexes of chromium (0) and tungsten (0), (CO)5Cr[C(R′)R″] and (CO)4M(PR3)[C(R′)R″] and trans-(CO)4M(PR3)[C(R′)R″]. Photochemical reaction at low temperatures and in the case where R′==NH2 and NHCH3, yields only the cis-isomers. The structures of the yellow to red, diamagnetic compounds were established by analyses and spectra.
    Notes: Bei der thermischen Umsetzung von tertiären Phosphinen PX3 [X3=(CH3)3, (C2H5)3, (n-C4H9)3, (n-C8H17)3, (C3H7)3, (C6H11)2C6H5, (C6H5)2C2H5)3, (p-C6H4CH3)3- (p-C6H4F)3, (m-C 6H4F)3] mit Pentacarbonyl(carben)-Komplexen von Chrom (0) und Wolfram(0), (CO)5Cr[(R′)R″] und (CO)5W[ C(R′)R″] (R′=OCH3, OC2H5; R″==CH3, C2H5, i-C3H7, C6H5), erhält man im Temperaturbereich zwischen 60 und 80°C unter CO-Abspaltung sowohl die cis-als auch die trans-Isomeren der Tetracarbonyl(carben)-(phosphin)-Komplexe (CO)4M(PR3)[C(R′)R″]. desgleichen bei photochemischer Reaktion bei Raumtemperatur. Bei photochemischer Umsetzung bei tiefen Temperaturen und für R′=NH2 oder NHCH3 fallen jedoch nur die cis-Verbindungen an. Die Konstitutionen der gelben bis roten, diamagnetischen Verbindungen wurden analytisch und spektroskopisch gesichert.
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  • 2
    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, CXXVII. Kinetic and Mechanistic Investigations of Transition Metal Complex Reactions, XI11 2. Diethylamino(phenyltel1uro)carbene- and Diethylaminocarbyne(phenyltelluro) Complexes of Chromium: Preparative Investigations and Kinetics of the C, Cr-Migration of PhTePentacarbonyl(diethylaminocarbyne)chromium tetrafluoroborate, [(CO)5CrCNEt2]BF4 (1), reacts with lithium tellurophenolate, Li[TePh], with addition of the tellurophenolate anion to the carbyne carbon atom to give pentacarbonyl[diethylamino(phenyltelluro)carbene]chromium, (CO)5Cr[C(TePh)NEt2] (2). On heating in solution, the complex 2 rearranges with CO-elimination and C, Cr-migration of TePh to give trans-tetracarbonyl(diethylaminocarbyne)(phenyltelluro)chromium, trans-(PhTe)(CO)4CrCNEt2 (3). The rearrangement follows a first order rate law (-d[2]/dt = k[2]; ΔH≠ = 108 ± 1 kJmol-1; ΔS≠ = 42 ± 4 Jmol-1K-1; in 1,1,2-trichloroethane). In solution, 3 dimerizes with CO-elimination to give bis(μ-phenyltelluro)-bis[tricarbonyl(diethylaminocarbyne)chromium], (μ-PhTe)2[(CO)3CrCNEt2]2 (4). Addition of PPh3 to solutions of 2 does not influence the rate of the rearrangement but leads to a different product, mer-(PhTe)(CO)3(PPh3)CrCNEt2 (5).
    Notes: Pentacarbonyl(diethylaminocarbin)chrom-tetrafluoroborat, [(CO)5CrCNEt2]BF4 (1), reagiert mit Lithium-tellurophenolat, Li[TePh], unter Addition des Tellurophenolat-Anions an das Carbin-kohlenstoffatom und Bildung von Pentacarbonyl[diethylamino(phenyltelluro)carben]chrom, (CO)5Cr[C(TePh)NEt2] (2). Beim Erwärmen in Lösung lagert sich der Komplex 2 unter CO-Abspaltung und C, Cr-Wanderung von TePh nach einem Geschwindigkeitsgesetz erster Ordnung (-d[2]/dt = k[2]; ΔH≠ = 108 ± 1 kJmol-1; ΔS≠ = Jmol-1K-1; in 1,1,2-Trichlorethan) zu trans-Tetracarbonyl(diethylaminocarbin)(phenyltelluro)chrom, trans-(PhTe)(CO)4-CrCNEt2 (3), um. In Lösung dimerisiert 3 unter CO-Eliminierung zu Bis(μ-phenyltelluro)-bis[tricarbonyl(diethylaminocarbin)chrom], (μ-PhTe)2[(CO)3CrCNEt2]2 (4). Zusatz von PPh3 zu Lösungen von 2 beeinflußt zwar die Umlagerungsgeschwindigkeit nicht, liefert jedoch als Reaktionsprodukt mer-(PhTe)(CO)3(PPh3)CrCNEt2 (5).
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  • 3
    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, LIV. Synthesis of Transition Metal Carbonyl Ylide Complexes from Transition Metal Carbonyl Carbene ComplexesSecondary und tertiary alkylphosphines PX3 [X3 = (CH3)3, (C2H5)3, (n-C4H9)3, (CH3)2H] react with (alkoxycarbene)- or (alkylthiocarbene)pentacarbonyl complexes of chromium(0) and tungsten(0),(CO)5Cr[C(OCH3)C6H5], (CO)5W[C(OCH3)CH3] and (CO)5W[C(SCH3)CH3], at low temperatures to give the corresponding ylidepentacarbonylmetal complexes (CO)5M[C(PX3)(YCH3)(Z)] (M = Cr, W; Y = O, S; Z = CH3, C6H5) under addition of the phosphines to the carbene carbon atom. The structures of the pale yellow, diamagnetic, and partially very thermolabile compounds were established by analysis, i.r., n.m.r., and mass spectra. The partial thermal conversion of (CO)5Cr[C(P(CH3)2H)(OCH3)(C6H5)] in acetone was shown to yield (CO)5Cr{P(CH3)2[CH(OCH3)(C6H5)]}.
    Notes: Durch Umsetzung sekundärer und tertiärer Alkylphosphine PX3 [X3 = (CH3)3, (C2H5)3, (n-C4H9)3, (CH3)2H] mit den (Alkoxycarben)- bzw. (Alkylthiocarben)pentacarbonyl-Komplexen von Chrom(0) und Wolfram(0), (CO)5Cr[C(OCH3)C6H5], (CO)5W[C(OCH3)CH3] und (CO)5W[C(SCH3)CH3], bei tiefen Temperaturen wurden unter Addition der Phosphine an das Carbenkohlenstoffatom entsprechende Ylid-pentacarbonylmetall-Komplexe (CO)5 M[C(PX3) (YCH3)(Z)] (M = Cr, W; Y = O, S; Z = CH3, C6H5) erhalten. Die Strukturen der schwach gelblichen, diamagnetischen, z T. sehr thermolabilen Verbindungen wurden durch Analyse, IR-, NMR- und Massenspektren gesichert. Die partielle thermische Reaktion von (CO)5Cr[C(P(CH3)2H)(OCH3)(C6H5)] in Aceton zu (CO)5Cr{P(CH3)2[CH(OCH3)(C6H5)]} wurde nachgewiesen.
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  • 4
    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, XVII. Ring-substituted trans-Bromotetracarbonyl(phenylcarbyne) Complexes of Chromium and TungstenThe preparation and spectroscopic properties of a series of ring-substituted trans-bromotetra-carbonyl(phenylcarbyne) complexes Br(CO)4MCR [M = Cr, W; R = C6H4N(CH3)2-(p), C6H4CH3-(p), C6H4OCH3-(p), C6H2(CH3)3-(2,4,6), C6H4CF3-(p), C6H4C6H5-(o), C6H3Cl2-(2,6), C6Cl5] are described. The influence of the substituents on the vCO absorptions and on the 13C n. m. r. signals is discussed. The X-ray structure analysis of trans-Br(CO)4CrCC6H4CF3-(p) reveals the extremely short Cr—Ccarbyne bond length of 168 ± 2 pm.
    Notes: Die Darstellung und die spektroskopischen Eigenschaften einer Reihe von ringsubstituierten trans-Bromotetracarbonyl(phenylcarbin)-Komplexen Br(CO)4MCR [M = Cr, W; R = C6H4N(CH3)2-(p), C6H4CH3-(p), C6H4OCH3-(p), C6H2(CH3)3-(2,4,6), C6H4CF3-(p), C6H4C6H5-(o), C6H3Cl2-(2,6), C6Cl5] werden beschrieben und der Einfluß der Substituenten auf die vCO-Absorptionen und die 13C-NMR-Signale diskutiert. Die Röntgenstrukturanalyse von trans-Br(CO)4CrCC6H4CF3-(p) ergibt für die Cr—CCarbin-Bindung den extrem kurzen Abstand von 168 ± 2 pm.
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  • 5
    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, CXVIII1) Kinetic and Mechanistic Investigations of Transition Metal Complex Reactions, VIII2) C, Cr-Migration of SeR in (CO)5Cr[C(SeR)NEt2]: Kinetic, Mechanistic and Preparative InvestigationsOn heating in solution, [(arylseleno)(diethylamino)carbene]pentacarbonylchromium complexes, (CO)5Cr[C(SeR)NEt2], (2) [R = 4-C6H4CF3 (a), 4-C6H4Br (b), 4-C6H4F (c), C6H5 (d), 4-C6H4CH3 (e), 4-C6H4OCH3 (f), 1-C10H7 (g)] rearrange with CO-elimination and C, Cr-migration of SeR to form the corresponding trans-(arylseleno)tetracarbonyl(diethylaminocarbyne) chromium complexes, trans-RSe(CO)4CrCNEt2, (3a-g). The rearrangement follows a first-order rate law. Free carbon monoxide does not influence the reaction rate whereas the Polarity of the solvent and the type of the substituent R only influence the rate of the reaction to a very small extent. The activation enthalpies are ΔH≠ = 101-104 kj mol-1, the activation entropies ΔS = 27-33 j mol-1 K-1. Addition of PPh3 to solutions of 2d does not influence the rate of the rearrangement but leads to a different reaction product, mer-(CO)3(PPh)3(SePh)CrCNEt2 (4d). Complex (4d). is also formed by photolysis of 2d in the presence of PPh3, The compounds 3a - d and 4d are characterized by analytical and spectroscopic means, 3c, additionally by an X-ray analysis.
    Notes: Beim Erwärmen in Lösung lagern sich die [(Arylseleno)(diethylamino)carben]pentacarbonyl-chrom-Komplexe, (CO)5Cr[C(SeR)NEt2], (2) [R = 4-C6H4CF3 (a), 4-C6H4Br (b), 4-C6H4 (c_, C6H4 (d), 4-C6H4OCH3 (e) 4-C6H4OCH3 (f), 1-C10H7 (g)] unter CO-Abspaltung und C, Cr-Wanderung von SeR zu den entsprechenden trans-(Arylseleno)tetracarbonyl(diethylaminocarbin)-chrom-Komplexen, trans-RSe(CO)4CrCNEt2, (3a-g) nach einem Geschwindigkeitsgesetz erster Ordnung um. Freies Kohlenmonoxid ist ohne, die Polarität des Solvens sowie die Art des Substituenten R sind nur von geringem Einfluß auf die Reaktionsgeschwindigkeit. Die Aktivierungsenthalpien betragen ΔH≠ = 101 104 kj mol-1, die Aktivierungsentropien ΔS≠ = 27-33 j mol-1 K-1. Zusatz von PPh3 zu Lösungen von 2d beeinflußt zwar die Umlagerungsgeschwindigkeit nicht, man erhält jedoch mer-(CO)3(PPh)3(SePh)CrCNEt2 (4d) als Reaktionsprodukt. Photolyse von 2d in THF in Anwesenheit von PPh3 liefert ebenfalls 4d. Die Verbindungen 3a-d und 4d wurden analytisch und spektroskopisch gesichert, 3c zusätzlich durch eine Röntgenstrukturanalyse.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 100 (1967), S. 755-766 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei Kumulenen mit ungerader Anzahl von kumulierten Doppelbindungen sind isomere Doppelradikal- bzw. Dipolar-Formen (2a bzw. 2b) denkbar. Die Möglichkeiten für das Auftreten derselben werden quantenchemisch und experimentell untersucht.
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  • 7
    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, LXIX. Isomerism of cis- and trans-(Alkoxycarbene)tetracarbonyl(phosphine)metal Complexes and Dependence of the Equilibrium ConstantsSolutions of cis- and trans-(alkoxycarbene)tetracarbonyl(phosphine)metal complexes, (CO)4M(PR3)[COR′)R″] [M=Cr, W; R3=(CH3)3, (C2H5)3, (n-C4H9)3, (n-C8H17)3, (i-C2H7)3, (C6H11)3, (C2H5)2C6H5, (C6H5)2C2H5, (C6H5)3, (p-C6H4CH3)3, (p-C6H4F)3, (m-C6H4F)3; R′=CH3, C2H5; R″=CH3, C2H5, i-C3H7, C6H7, C6H5] on heating isomerize to an equilibrium situation. The equilibrium constants are dependent upon the solvent, the central metal, the phosphine group and the carbene ligand.
    Notes: cis-u. trans-(Alkoxycarben)tetracarbonyl(phosphin)metall-Komplexe, (CO)4M(PR3)[(OR′)R′] [M=Cr, W; R3=(CH3)3, (C2H5)3, (n-C4H9)3, (n-C8H11)3, (C3H5)3, (C 6H11)3, (C2H5)2C6H5, (C2H5)2C2H5, (C6H5)3, (p-C6H4CH3)3, (p-C6H4F)3, (m-C 6H4F)3; R′=CH3, C2H5; R′=CH3, C2H5, i-C3H7, C6H5] isoerisieren beim Erwärmen in Lösung bis zu einem Gleichgewichtszustand. Die lage dieses Isomerisierungsgleichgewichts ist durch die Wahl des Lösungsmittels. des Zentralmetalls der Phosphingruppe und des Carbenliganden beeinflußbar.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 2459-2467 
    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, LXXIV. Reversible Addition of Tertiary Phosphines on Pentacarbonyl(methoxymethylcarbene) Metal ComplexesThe reaction of tertiary phosphines PR3 [PR3 = P(C4H9)3, P(C2H5)2C6H5, P(i-C3H7)3] with pentacarbonyl(methoxymethylcarbene)metal complexes of chromium(O) and tungsten(O), (CO)5Cr[C(OCH3)] and (CO)5W[C(OCH3)], at low temperatures results in a reversible addition of the phosphine to the carbene ligand. The addition-dissociation-equilibrium constants depend on the temperature, the solvent, the phosphine, and the central metal.
    Notes: Bei der Umsetzung von tertiären phosphinen PR3 [PR3 = P(C4H9)3. P(C2H5)2 C6H5. P(i-C3H7)3] mit Pentacarbonyl(methoxymethylcarben)chrom(O) bzw. -wolfram(O). (CO)5Cr[C(OCH3)CH3] bzw. (CO)5W[C(OCH3)CH3], bei tiefen Temperaturen erfolgt eine Gleichgewichtskonstanten hängen von der Temperatur, dem Lösungsmittel, der Art des Phosphins und des Zentralmetalls ab.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 3209-3219 
    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, CXVII1) [(Arylseleno)(diethylamino)carbene]pentacarbonylchromium(0)Pentacarbonyl(diethylaminocarbyne)chromium tetrafluoroborate, [CO)5CrCNEt2]BF4, (1) reacts with lithium arylselenolate, LiSeR, (3) [R = 4-C6H4CF3 (a), 4-C6H4Br (b) 4-C6H4F (c), C6H5 (d), 4-C6H4CH3 (e), 4-C6H4OCH3 (f), 1-C10H7 (g)] with addition of the selenolate anion to the carbyne carbon atom to give [(arylseleno)(diethylamino)carbene]pentacarbonylchromium(0), (CO)5Cr[C(SeR)NEt2], (4a - g). The complexes 4 were characterized by elemental analyses, spectroscopic data and in the case fo 4d additionally by an X-ray analysis. On heating in solution, 4a - g rearrange with CO-elimination and C,Cr-migration of SeR to the corresponding trans-(arylseleno)tetracarbonyl(diethylaminocarbyne)chromium complexes, trans-RSe(CO)4-CrCNEt2, (5a - g).
    Notes: Pentacarbonyl(diethylaminocarbin)chrom-tetrafluoroborat, [(CO)5CrCNEt2]BF4, (1) reagiert mit Lithium -arylselenolat, LiSeR, (3) [R = 4-C6H4CF3 (a), 4-C6H4Br (b) 4-C6H4 (c), C6H5 (d), 4-C6H4CH3 (e), 4-C6H4OCH3 (f), 1-C10H7 (g)] unter Addition des Selenolat-Anions an das Carbinkohlenstoffatom und Bildung von [Arylseleno)(diethylamino)carben]pentacarbonylchrom(0), (CO)5Cr[C(SeR)NEt2], (4a-g). Die Komplexe 4 wurden elementaranalytisch, spektroskopisch sowie im Fall von 4d zusätzlich durch eine Röntgenstrukturanalyse gesichert. Beim Erwärmen in Lösung lagern sich 4a-g unter CO-Abspaltung und C, Cr-Wanderung von SeR zu den entsprechenden trans-(Arylseleno)tetracarbonyl(diethylaminocarbin)chrom-Komplexen, trans-RSe(CO)4(CrCNEt2, (5a-g) um.
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  • 10
    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, CXXII. Kinetic and Mechanistic Investigations of Transition Metal Complex Reaction, XII. Pentacarbonyl[diethylamino(triphenylplumbyl)carbene]chromium and trans-Tetracarbonyl(diethylaminocarbyne)(triphenylplumbyl)chromium: Preparative Investigations and Kinetics of the C,Cr-Migration of PbPh3Pentacarbonyl(diethylaminocarbyne)chromium tetrafluoroborate, [(CO)5CrCNEt2]BF4 (2), reacts with lithium triphenylplumbate, LiPbPh3 (3), with addition of the plumbate anion to the carbyne carbon atom to give pentacarbonyl[diethylamino(triphenylplumbyl)carbene]chromium, (CO)5-Cr[C(PbPh3)NEt2] (4). Already at room temperature, the complex 4 rearranges with CO-elimination and C,Cr-migration of PbPh3 to give trans-tetracarbonyl(diethylaminocarbyne)(triphenylplumbyl)chromium, trans-(Ph3Pb)(CO)4CrNEt2 (5). The rearrangement follows a first-order rate law (ΔH≠ = 103 kJmol-1; ΔS≠ = 40 Jmol-1, K-1, in 1,1,2-trichloroethane). The compounds 4 und 5 were characterized by analytical and spectroscopic means.
    Notes: Pentacarbonyl(diethylaminocarbin)chrom-tetrafluoroborat, [(CO)5CrCNEt2]BF4 (2), reagiert mit Lithium-triphenylplumbat, LiPbPh3 (3), unter Addition des Plumbat-Anions an das Carbinkohlenstoffatom und Bildung von Pentacarbonyl[diethylamino(triphenylplumbyl)carben]chrom, (CO)5Cr[C(PbPh3)NEt2] (4). Bereits bei Raumtemperatur lagert sich der Komplex 4 unter CO-Abspaltung und C,Cr-Wanderung von PbPh3 nach einem Geschwindigkeitsgesetz erster Ordnung (ΔH≠ = 103 kJmol-1, ΔS≠ = 40 Jmol-1, K-1, in 1,1,2-Trichlorethan) zu trans-Tetracarbonyl-(diethylaminocarbin)(triphenylplumbyl)chrom, trans-(Ph3Pb)(CO)4CrCNEt2 (5), um. Die Verbindungen 4 und 5 wurden analytisch und spektroskopisch gesichert.
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