NEW BIMETALLIC RHODIUM-ZIRCONIUM CATALYSTS FOR HOMOGENEOUS OLEFIN HYDROFORMYLATION

Catalytic activity of bimetallic system composed with Rh(acac)(CO)(2) and cp(2)Zr(CH(2)PPh(2))(2) or cp(2)ZrH(CH(2)PPh(2)) (cp=C5H5) in hex- 1-ene, 1,5-hexadiene and 1,7-octadiene hydroformylation have been stud ied at 80 degrees C, 10 atm of H-2/CO = 1. Hydroformylation of hex-1-e ne produces normal and branched aldehydes of 69-85% yield and n/iso ra tio 1.8-2.0. Hydroformylation of dienes gives unsaturated monoaldehyde s (ca. 30% yield). Applying H-1, P-31 NMR, UV-VIS and IR spectroscopy the following complexes have been identified: Rh(acac)(CO)(2)L (1), Rh (acac)(CO)(L) (2), and Rh-4(CO)(x)L(12-x) (3) (where: L = cp(2)Zr(CH(2 )PPh(2))(2), cp(2)ZrH(CH(2)PPh(2)), x = 8-11).