Platinum Model Studies for Palladium-Catalyzed Oxidative Functionalization of C−H Bonds

The synthesis of (CN)PtII(acac) complexes (CN = benzo[h]quinoline, 8-methylquinoline) and their oxidation with PhI(OAc)2 are reported as a model system for palladium-catalyzed C−H bond functionalization. Dimeric PtIII−PtIII complexes containing a bridging acetate ligand are obtained in HOAc, and monomeric PtIV complexes incorporating alkoxide and acetate ligands are obtained in MeOH, EtOH, and iPrOH. The implications of these results for the mechanism of analogous Pd-catalyzed reactions is discussed.