In the recent years, bidentate P,P- and P,N-ligands derived from o,o<-disubstituted aromatic and hetero- aromatic compounds (such as biphenyl, binaphthyl, ferrocene, and diphenyl ether and its analogs linked through positions 6 and 6< by a heteroatom bridge), have become of specific importance [133] for metal- complex catalysis. These ligands are capable of forming complexes with transition metals, which possess a rigid skeleton having 435 units between the donor ...