Synthesis and characterization of new chiral Rh(I) complexes with N,N'-, and N,P-ligands. A study of anchoring on the modified zeolites and catalytic properties of heterogenized complexes

Article abstract of DOI:10.1016/0022-328X(94)05195-H

Novel chiral bidentate N,N'- and N,P-donors and their rhodium complexes were synthesized and characterized.The reactions of <2> and with different prepared chiral ligands: (S)-1-L-2-t-butylaminocarbonylpyrrolidine (1a, 1b), (S)-1-L-2-diphenylphosphinomethylpyrrolidine (2a, 2b), (S)-1-L-2-(1-naphthylaminocarbonyl)pyrrolidine (5a, 5b), (S)-1-L-2-(1-naphthylaminomethyl)pyrrolidine (7a, 7b) (a: L = t-butylaminocarbonyl, b: (3-trietoxysilylpropyl)aminocarbonyl) in the presence of a non-coordinating anion (PF6^-) gave the cationic tetracoordinate (L2 = COD or PPh3).The structures of these complexes were elucidated by elemental analysis, IR spectroscopy and 1H, 13C and 31P NMR measurements.The metal complexes with 1b, 2b, 5b and 7b, were anchored to silica and modified USY-zeolite and Rh-heterogenized complexes were obtained.A comparative study (homogeneous vs. suppported) was made for the catalytic activity and selectivity in several organic reactions.Keywords: Rhodium; Supported catalysts; Zeolites; Asymmetric hydrogenation; Asymmetric hydroxylilation; Cyclopropanation