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  • Articles: DFG German National Licenses  (3)
  • Cyclization  (1)
  • Organic Chemistry  (1)
  • Organosilyl, Alkoxysulfinyl Phosphine Cobalt Carbonyl Complexes  (1)
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  • Articles: DFG German National Licenses  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Heterocyclic derivatives of 2-amino-4-nitrophenol (1996)
    Springer
    Monatshefte für Chemie 127 (1996), S. 305-311 
    Details
    ISSN: 1434-4475
    Keywords: 2-Amino-4-nitrophenol ; Cyclization ; Dibromoalkane ; Rotamer
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Eine neue Methode zur Herstellung heterozyklischer Derivate von 2-Amino-4-nitrophenol wird vorgestellt. Dieses allgemeine Verfahren kann zur Synthese von verschiedenen Ringsystemen (partielle gesättigte 1,4-Benzoxazine, 1,5-Benzoxazepine, 1,6-Benzoxazocine) benutzt werden. In den Lösungen derN-Formyl-Derivate können zwei Rotamere identifiziert werden. Ihre relative Menge hängt vom Lösungsmittel ab.
    Notes: Summary A new pathway for the synthesis of cyclic derivatives of 2-amino-4-nitrophenol by application of dibromoalkanes is described. This general method was used for the preparation of several heterocycles (partially saturated 1,4-benzoxazines, 1,5-benzoxazepines, 1,6-benzoxazocines). Two rotamers are present in solution of theN-formyl derivatives, the relative amounts depending on the solvent used.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00813796
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    Paper (German National Licenses)
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  • 2
    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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    Paper (German National Licenses)
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  • 3
    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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    Paper (German National Licenses)
    Fulltext
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