Zusammenhaenge zwischen Alkinkomplexierung und-Aktivierung in Komplexen des Types (Ligand)2Ni(Alkin)

Article abstract of DOI:10.1016/0022-328X(87)80329-7

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 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 C-C coupling reactions.