Characterization of DMSO coordination to palladium(II) in solution and insights into the aerobic oxidation catalyst, Pd(DMSO)2(TFA)2.

ABSTRACT: Recent studies have shown that Pd(DMSO)(2)(TFA)(2) (TFA = trifluoroacetate) is an effective catalyst for a number of different aerobic oxidation reactions. Here, we provide insights into the coordination of DMSO to palladium(II) in both the solid state and in solution. A crystal structure of Pd(DMSO)(2)(TFA)(2) confirms that the solid-state structure of this species has one O-bound and one S-bound DMSO ligand, and a crystallographically characterized mono-DMSO complex, trans-Pd(DMSO)(OH(2))(TFA)(2), exhibits an S-bound DMSO ligand. (1)H and (19)F NMR spectroscopic studies show that, in EtOAc and THF-d(8), Pd(DMSO)(2)(TFA)(2) consists of an equilibrium mixture of Pd(S-DMSO)(O-DMSO)(TFA)(2) and Pd(S-DMSO)(2)(TFA)(2). The O-bound DMSO is determined to be more labile than the S-bound DMSO lig

SUBMITTER: Diao T 

PROVIDER: S-EPMC3494491 | biostudies-literature | 2012 Nov

REPOSITORIES: biostudies-literature