Stoichiometric and Catalytic
Reactions of Thermally
Stable Nickel(0) NHC Complexes
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Abstract
Although there are many organic reactions that are catalyzed
by
either Ni<sup>0</sup> or Pd<sup>0</sup> complexes, in comparison with
the case for Pd<sup>0</sup> there has been significantly less work
studying coordinatively unsaturated Ni<sup>0</sup> complexes. Here,
we develop a simple synthetic route for preparing a number of thermally
stable NHC-supported Ni<sup>0</sup> hexadiene complexes in good yield.
We examine the stoichiometric reactivity of one of these species and
demonstrate that the coordinated hexadiene moiety is labile and can
be replaced with a variety of different ligands, including CO, phosphines,
isonitriles, and olefins. In addition, we show that the Ni<sup>0</sup> hexadiene complexes are relatively rare examples of homogeneous
first-row transition-metal catalysts for the hydrogenation of olefins