PREPARATION AND CATALYTIC PROPERTIES OF CATIONIC RHODIUM(I) COMPLEXES CONTAINING 2,2'-BIS(DIPHENYLPHOSPHINO)BIPHENYL

Article abstract of DOI:10.1016/S0022-328X(00)94098-1

Complexes of the type X (cod is 1,5-cyclooctadiene, bpbp is 2,2'-bis(diphenylphosphino)biphenyl, and X is Cl^-, d-α-bromocamphor-?-sulfonate <(d)-C10H14O4SBr>^-, PF6^- or B(C6H5)4^-) are discussed, <(d)-C10H14O4SBr> was obtained in optically active form.The catalytic activities of these complexes were evaluated through the hydrogenation in 2-acetamidoacrylic acid (AAA) and α-acetamidocinnamic acid (ACA).They are so active that in their presence hydrogenation takes place at ambient temperatures and pressures.Hydrogenations by the use of the (+)₅₈₉-forms gave optically active N-acetyl-(R)-alanine and N-acetyl-(R)-phenylalanine.