The versatility of organopalladium pincer complexes in catalytic organic syntheses has attracted great attention. Although most studies have been focused on their catalytic applications, mechanisms of many catalytic processes using such complexes have yet to be clarified. We have synthesized a new set of Pd(II) bis(phosphinite)-pincer 19F NMR-reporter complexes. The aryl-F NMR signal should provide useful metrics (chemical shifts and coupling constants) for correlation with catalytic activity and selectivity and in mechanistic studies of these organic tranformations. Halide-metathesis equilibria have been monitored by 19F and 31P NMR. Complexes [(F-pincer)Pd-L+]PF6- for L = AsPh3 and py, have been prepared in good yield by treating the Pd-Cl species with TlPF6. Activation energies for dissociation of L have been measured by Electrospay-Ionization Infrared Multiphoton Dissociation Ion Cyclotron Resonance.
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