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- W2040808973 abstract "In the well-defined new Ni0 complexes (ligand)2Ni(acetylene) the different methods of complexation of acetylenes is influenced by the electronic properties of ligands and acetylene substituents, as interpreted from their infrared spectra. So, in the case of acceptor acetylenes the best complexation with a donor ligand (and vice-versa) was found. The degree of complexation is proportional to the activation of the complexed acetylene and is illustrated by a number of reactions, which are different for acceptor and donor ligands. Cyclooligomerization of acetylenes is the most interesting example because strong donor ligands in complex catalysts affect the system in such a way that we obtained excellent catalysts with turnover numbers of more than 1000000 moles of acetylene per mole of catalyst. Such catalysts are as yet unknown in acetylene chemistry and very rare in other CC coupling reactions. In gut definierten neuen Ni0-Komplexen (Ligand)2Ni(Acetylen) wird die unterschiedliche Komplexierung von Acetylenen durch elektronische Eigenschaften von Liganden und Acetylensubstituenten beeinflusst wie die Interpretation von IR-Spektren zeigt. So fanden wir im Falle von Akzeptor-Acetylenen die beste Komplexierung in Kombination mit Donor-Liganden und umgekehrt. Der Grad der Komplexierung steht in Zusammenhang mit der Aktivierung von komplexierten Acetylenen und wird durch einige Reaktionen veranschaulicht, die für Akzeptor- und Donorliganden verschieden sind. Cyclooligomerisierung von Acetylenen ist das interessanteste Beispiel, weil starke Donorliganden in Komplexkatalysatoren das System derart beeinflussen, dass wir hervorragende Katalysatoren mit Umsatzzahlen von mehr als 1000000 Molen Acetylen pro Mol Katalysator erhielten. Solche Katalysatoren sind bisher unbekannt in der Acetylenchemie und sehr selten in anderen CC-Kupplungsreaktionen." @default.
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- W2040808973 date "1987-02-01" @default.
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- W2040808973 title "Zusammenhänge zwischen alkinkomplexierung und -aktivierung in komplexen des typs (ligand)2Ni(alkin)" @default.
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