Pincer-supported Rh complexes can undergo a number of oxidative addition (OA) and reductive elimination (RE) reactions that mirror the reactivity Pd (and Ni).  For Rh, this involves the +1/+3 or oxidation states in contrast to 0/+2 for Pd chemistry.  Unsaturated, three-coordinate, T-shaped (pincer)Rh fragments are critical for this chemistry as intermediates in OA and RE and are analogous to the role of unsaturated LPd(0) intermediates.  This presentation will demonstrate how judicious selection of the pincer ligand can allow parlaying the requisite stoichiometric reactions into successful catalysis.  For example, we will discuss the use of (PCP)Rh complexes in C-C and other C-heteroatom coupling reactions.  The presentation will also address the potential for extending the chemistry observed with Rh to its lighter and cheaper congener, cobalt, and the specific challenges associated with implementing Co(I)/Co(III) chemistry in the pincer context.

Aryl halide coupling reactions with pincer complexes of group 9 metals

247th National Meeting (2014)

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