| http://www.w3.org/ns/prov#value | - This classification takes into account in particular the stability, activity and potentialstereoselectivity of metal complexes with phosphorus ligands as catalyst precursors or catalysts.In addition to the widely used C.sub.2-symmetrical bidentate ligand systems such as DUPHOS, DIOP, BINAP or DEGUPHOS, attention is increasing being focused on asymmetrical bidentate organophosphorus ligands in the
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