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Untersuchungen zur Reaktivitat von 2-Oxacyclopentyliden-Komplexen

Untersuchungen zur Reaktivitat von 2-Oxacyclopentyliden-Komplexen


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About the Book

In der vorliegenden Dissertation werden Reaktivitaten und synthetische Moglichkeiten zyklischer Carben-Komplexe des Chroms und des Wolframs beschrieben. Durch Umsetzung von Pentacarbonyl(2 oxacyclopentyliden)chrom und -wolfram mit Arylsaurechloriden werden Oxazyklen mit zweifach substituierter exozyklischer Doppelbindung erhalten. Der Einfluß der verschiedenen Substituenten auf die elektronischen Verhaltnisse des Komplexes spiegelt sich in den Absorptionen der Carbonyl-Schwingungen in den Infrarot-Spektren wider, weshalb derartige Komplexe auch als Sensoren geeignet sein konnten. Durch Umsetzung mit Benzoylcyanid und Meerweinsalz werden ebenfalls derartige Komplexe erhalten, deren weitere synthetische Anwendungsmoglichkeiten untersucht wurden. Durch Oxidation lassen sich daraus substituierte Lactone erhalten. Die Umsetzung mit Alkinen fuhrt zu einer Benzanellierung unter Abspaltung des Pentacarbonyl-Chrom-Fragments. Durch Umsetzung substituierter Oxazyklen mit Ammoniak konnen entsprechend substituierte azazyklische Carben-Komplexe erhalten werden. Bei der Alkylierung des Stickstoffatoms werden die Bildung von cis/trans-Isomeren und die Bildung von Chelat-Komplexen beobachtet. Azazyklische Carben-Komplexe konnen aber auch durch Umsetzung von Kalium(pentacarbonyl)chromat mit geeignet substituierten Pyrrolidon-Derivaten erhalten werden. Bei der Umsetzung von Pyrrolidon-Derivaten mit Carben-Komplexen, welche acide Protonen tragen, wird anstelle einer Insertion eine Kondensationsreaktion beobachtet.


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Product Details
  • ISBN-13: 9783736990678
  • Publisher: Na
  • Height: 210 mm
  • Weight: 32 gr
  • ISBN-10: 3736990677
  • Binding: Paperback
  • Language: German
  • Width: 760.999 mm


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Untersuchungen zur Reaktivitat von 2-Oxacyclopentyliden-Komplexen
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Untersuchungen zur Reaktivitat von 2-Oxacyclopentyliden-Komplexen
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