Chelated palladium and platinum complexes of diphosphinite ligands, ch<sub>2</sub>(o-c<sub>6</sub>h<sub>4</sub>opph<sub>2</sub>)<sub>2</sub> and ph<sub>2</sub>po(ch<sub>2</sub>)<sub>3</sub>opph<sub>2</sub>: characterization and catalytic activity

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