A New Twist on Pincer Complexes for Catalysis John Protasiewicz, Department of Chemistry Case Western Reserve University, Cleveland, Ohio 44106 High twist angle pincer complexes: We have shown that a variety of such complexes can be quickly made, are very air and water stable, and that they are also structurally rigid and sterically demanding. X-ray Structures & VT NMR Spectroscopy: sim spectra exptl spectra hindered rotation about N-Ar in palladum diimine pincer complexes bonds causes temperature dependent 1H NMR spectra N Pd N I Catalysis: challenging C-C bond forming reactions: best catalyst precursor: 3n diphosphonite ligands