Synthesis and Catalytic Activity of [Cp′Co(COD)] Complexes Bearing Pendant N-Containing Groups

Abstract

The novel Co(I)-complex [CpCNCo(COD)] (CpCN = η5-(C5H4CMe2CH2CN), COD = 1,5-cyclooctadiene; 3) with a substituted cyclopentadienyl ligand containing a pendant nitrile moiety has been synthesized and characterized by X-ray diffraction. The reactivity of the nitrile group in 3 has been investigated regarding its behavior in cyclization reactions with alkynes, leading to three new complexes containing pendant 2-pyridyl groups. All synthesized complexes have been evaluated as catalysts in the [2 + 2 + 2] cycloaddition reaction of 1,6-heptadiyne and benzonitrile.

Group 4 Metal Complexes of Chelating Cyclopentadienyl-ketimide Ligands

“…We have recently described the preparation of a series of group 4 bent metallocene complexes with pendant nitrile groups, and we studied transformations of such moieties connected to transition metal complexes . We have found that under certain conditions an addition of organyl lithium reagent across the pendant nitrile accompanied by an alkylation at the metal took place.…”

Reactivity of a Titanocene Pendant Si–H Group toward Alcohols. Unexpected Formation of Siloxanes from the Reaction of Hydrosilanes and Ph3COH Catalyzed by B(C6F5)3

“…The present work is the result of our long-term interest in the preparation of group 4 metallocene and related complexes with pendant functional groups, which are modifiable directly within the organometallic framework. − The pendant Si–H group seemed to be a convenient choice for further transformations, since it is easily introduced at early stages of the metallocene dichloride synthesis and is also reasonably stable toward air and moisture under laboratory conditions. The Si–H group on the metallocene periphery can subsequently be modified via either catalytic hydrosilylation , or intramolecular dehydrocoupling reactions. , …”

Synthesis and Structure of Low-valent η4 -Cinnamaldehyde Cobalt Complexes

“…In the literatures, the π‐coordinated C=C bond length in cobalt complex is approximately between 1.380 and 1.415 Å . The π‐coordinated C=C bond length in complexes 1 – 4 is in the range of 1.425 to 1.430 Å.…”