Dinuclear Palladium(0) and Platinum(0) Complexes with p-Benzoquinone and Norbornene Ligands

Palladium(0) and platinum(0) precursor complexes, Pd 2 (dba) 3 and Pt(dba) 2, reacted with p -benzoquinone (bq) and norbornene (nbe) to afford new dinuclear complexes possessing p -benzoquinone as a bridging ligand and norbornene as a monodentate ligand, Pd 2 (bq) 2 (nbe) 2 and Pt 2 (bq) 2 (nbe) 2, respectively. The solid-state structure of the obtained complexes presented the short metal−metal distances similar to predecessors possessing the significant d 10 −d 10 bonding interaction. The formations of the previously reported mononuclear p -benzoquinone and p -naphthoquinone complexes using 1,5-cyclooctadiene in place of norbornene were also unambiguously confirmed by the single-crystal X-ray diffraction studies. The present dinuclear palladium complex proved to be an efficient catalyst precursor for the linear cotrimerization of 1-octene and dimethyl acetylenedicarboxylate. On the other hand, the platinum analogue catalyzed the hydrosilylation of styrene under mild reaction conditions.