Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Sol–gel process wikipedia , lookup
Fischer–Tropsch process wikipedia , lookup
Ring-closing metathesis wikipedia , lookup
Metal carbonyl wikipedia , lookup
Evolution of metal ions in biological systems wikipedia , lookup
Metalloprotein wikipedia , lookup
Spin crossover wikipedia , lookup
Wolff–Kishner reduction wikipedia , lookup
Hydroformylation wikipedia , lookup
Abstract The use of first row transition metals in catalysis as a substitute for scarce and expensive second and third row transition metals is still a challenge One strategy to promote the use of first row transition metals is the use of bimetallic complexes as the cooperativity between the metal centers might enable reaction pathways that are not accessible with mononuclear catalysts. Therefore, the aim of this study was to prepare a catalytically relevant bimetallic Nickel(II)complex with bridging NCP ligands and a chloro ligand at each metal center (Scheme 1). Reaction of a nickel(II) monomer with sodium azide did not yield the desired dimer as replacement of chloro ligands by azido ligands occurred, yielding a dimer with square planar configuration at each metal center. Abstraction of the chloro ligand from the monomer followed by reaction with sodium azide was also unsuccessful. However, reaction of the monomer with methyllithium led to cleavage of the silyl-carbon bond, indicating that the projected dimer formation can be achieved. However, hydrolysis of the carbanion prevented formation of the desired complex. The exact nature of this product is not known and the compound needs to be characterized more thoroughly. In addition, dimer formation via reaction with methyllithium has to be examined in extensively dried conditions in order to see whether the formed carbanion can lead to formation of the desired dimer. Ph Ph P N SiMePh 2 Cl Ni N Ni P Cl Ph SiMePh 2 Ph Scheme 1 The projected nickel(II)-dimer