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  • 1
    Electronic Resource
    Electronic Resource
    Control of asymmetric induction in the organometallic synthesis of 3-methyl-(E)-4-hexen-2-one (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 3 (1991), S. 324-330 
    Details
    ISSN: 0899-0042
    Keywords: bis(μ-methyl-1,3-dimethyl-η3-allylnickel) ; menthyl phosphines ; menthoxy phosphines ; carbon monoxide ; parity control ; complementarity control ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bis(μ-methyl-1,3-dimethyl-η3-allylnickel) reacts in the presence of phosphorus(III) ligands (phosphines, phosphites) with CO to give 3-methyl-(E)-4-hexen-2-one. Systematic experiments were performed using chiral ligands containing menthyl or menthoxy groups and different achiral groups on the P atom to determine the influence of ligand structure and concentration on the direction and extent of chiral induction in this ketone synthesis. It could be shown that reversion of enantioselectivity can be obtained not only by the obvious method of reversing the absolute configuration of the ligand (“parity control”) but also by modifying the nonchiral substituents of the phosphorus ligand (“complementarity control”). The synthesis, physical, and spectroscopic properties of several new menthyl phosphines and phosphites are reported.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chir.530030418
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  • 2
    Electronic Resource
    Electronic Resource
    Schwefeldioxid als Ligand und Synthon. IX. Reaktionen von Cobaltcarbonylen mit Schwefeldioxid - Synthese und Charakterisierung von Alkoxysulfinyl-Cobaltcarbonyl-Komplexen (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 592 (1991), S. 141-152 
    Details
    ISSN: 0044-2313
    Keywords: Phosphine Cobalt Carbonyl Complexes ; Alkyl, Alkoxy Cobalt Carbonyls ; Sulfur Dioxide ; Organosilyl, Alkoxysulfinyl Phosphine Cobalt Carbonyl Complexes ; Synthesis ; IR, 1H NMR Spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Sulfur Dioxide as Ligand and Synthon. IX. Reactions of Cobalt Carbonyls with Sulfur Dioxide - Synthesis and Characterization of Alkoxysulfinyl-Cobalt Carbonyl ComplexesReactions of phosphine substituted Co2(CO)8, (Ph2P-(CH2)n-PPh2: n = 1, dppm; n = 2, dppe; n = 3, dppp; n = 4, dppb), alkylcobalt carbonyls and alkoxycobalt carbonyls with sulfur dioxide have been investigated. The SO2 containing cobalt complexes are characterized by means of I.R., 1H-NMR, and mass spectra. Further on synthesis and properties of new alkoxysulfinylphosphine-cobalttricarbonyl complexes of the type ROS(O)Co(CO)3PR31 (R = Ph3Si, Me; R1 = Et, i-Pr, Ph) are described.
    Notes: Reaktionen von phosphinsubstituiertem Co2(CO)8, (Ph2P-(CH2)n-PPh2: n = 1, dppm; n = 2, dppe; n = 3, dppp; n = 4, dppb), Alkylcobaltcarbonylen sowie Alkoxycarbonyl-Cobaltcarbonylen mit Schwefeldioxid wurden untersucht. Die Charakterisierung der gebildeten SO2 enthaltenden Cobaltkomplexe erfolgte mit Hilfe der IR-, 1H-NMR- und Massenspektroskopie. Darüber hinaus werden Synthese und Eigenschaften neuer Alkoxysulfinyl-Phosphin-Cobalttricarbonyl-Komplexe des Typs ROS(O)Co(CO)3PR31 (R = Ph3Si, Me; R1 = Et, i-Pr, Ph) beschrieben.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19915920115
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  • 3
    Electronic Resource
    Electronic Resource
    Contributions to the chemistry of transition metal alkyl compounds. 56. 2-(Dimethylaminomethyl)ferrocenyl derivatives of titanium and zirconium - limits of chelating interactions (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 590 (1990), S. 55-64 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Beiträge zur Chemie der Alkylverbindungen von Übergangsmetallen. 56. 2-(Dimethylaminomethyl) ferrocenyl-Derivate des Titans und Zirconiums - Grenzen der ChelatbildungAls neue Titanocen- bzw. Zirconocenkomplexe wurden das paramagnetische (η5-C5H5)2Ti(FcN) III (FcN = 2-[Dimethylaminomethyl]ferrocenyl) und das diamagnetische (η5-C5H5)2Zr(1-Camph)(FcN) IV (1-Camph = 1-Camphenyl) synthetisiert und durch Massen-, 1H- und 13C-NMR-Spektren sowie magnetische Messungen charakterisiert. Ferner wurden die Kristall- und Molekülstrukturen von (η5-C5H5)2M(FcN)2 (M = Ti I, Zr II) bestimmt. Eine M—C, N-Chelatbildung mit dem (Dimethylaminomethyl)ferrocenyl-Liganden wurde bei III (im Festkörper) und IV (in Lösung) gefunden, während diese bei I und II im kristallinen Zustand ausbleibt.
    Notes: The new paramagnetic (η5-C5H5)2Ti(FcN) III (FcN = 2-[dimethylaminomethyl]-ferrocenyl) and diamagnetic (η5-C5H5)2Zr(1-Camph)(FcN) IV (1-Camph = 1-Camphenyl) complexes were prepared and characterized by spectra and magnetic measurements. The crystal and solid phase molecular structures of (η5-C5H5)2M(FcN)2 (M = Ti I and Zr II) compounds were determined by single crystal X-ray diffraction. An M—C, N chelation of the (dimethylaminomethyl)ferrocenyl ligand was detected at compounds III (solid phase) and IV (solution), while such interaction fails at complexes I and II in crystalline phase.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905900107
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  • 4
    Electronic Resource
    Electronic Resource
    Subgroup 4 (Ti, Zr, Hf) derivatives of Cobalt Carbonyls (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 608 (1992), S. 173-183 
    Details
    ISSN: 0044-2313
    Keywords: Titanium ; zirconium ; hafnium ; cobalt carbonyl derivatives ; preparation ; i.r. ; 1H n.m.r.spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Titanium-, Zirconium- und Hafniumderivate von CobaltcarbonylenBimetallische und trimetallische Verbindungen mit M-Co-Bindungen (M = Ti, Zr, Hf) werden erhalten durch Reaktionen von R41-Derivaten (R1 = PhCH2; R22N; R2 = Me, Et) mit HCo(CO)4 (A) bzw. durch Umsetzung von R31MX-Derivaten (X = CI, Br; R1 = PhCH2, R22N und R3O; R3 = i-Pr, n-Bu) mit Na[Co(CO)4] (B). Dabei wurden Verbindungen des Typs R31MCo(CO)4 mit R1 = PhCH2, R2)2N und solche des typs R21M[Co(CO)4]2 mit R1 = PhCH2 nach den Methoden A und B gewonnen während (R3O)4-n Ti[Co(Co)4]n-Derivate (n = 1,2) nur gemäß Methode B zugängig waren.Phosphan- und Phosphitderivate der angeführten Verbindungen wurden erhalten bei Substitution von jeweils einer CO-Gruppe durch PR34-Liganden bzw. durch Reaktion von HCo(CO)3(PR34 mit R41M Verbindungen. Der Einfluß der Substituenten R1 und PR34 auf die Stabilität der Verbindungen wird diskutiert.
    Notes: Bimetallic and trimetallic compounds containing unsupported bonds of subgroup 4 metals (M = Ti, Zr, Hf) and Co were prepared by hydride elimination (A) from R41M derivatives (R1 = PhCH2; R22N; R2 = Me, Et)) and by salt elimination (B) from R31MX (X = Cl, Br; R.1 = PhCH2, R22N and R3O; R3= i-Pr, n-Bu)) by reaction with HCo(CO)4 and Na[Co(CO)4], respectively. Compounds R31MCo(CO)4 with R1 = PhCH2, R21M[Co(CO)4]2 R.1 = PhCH2, were prepared both by methods A and B, while (R3O)4-n Ti[Co(Co)4]n (n = 1, 2) compounds were obtained by reaction B. Several tertiary phosphine and phosphite derivatives of the former two types were obtained by substitution of a carbonyl group by PR34 ligand or by A type reaction of HCo(CO)3(PR34 with R41M compounds.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926080226
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  • 5
    Electronic Resource
    Electronic Resource
    Vorbericht (1991)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 602 (1991), S. 178-178 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19916020119
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