Immobilization of rhodium catalysts in biphasic systems and in layered structures using phosphonated phosphines

Uncomplicated syntheses of phosphines substituted with phosphonic acid groups have been developed. The ligands were used to immobilize rhodium catalysts in aqueous biphasic systems and between the layers of zirconium phosphate hybrid materials. Effective immobilization, high activities (turnover frequencies higher than 600 h^-1) and selectivities were found in the hydroformylation of 1-octene to nonanal and 2-methyloctanal. This revised version was published online in June 2006 with corrections to the Cover Date.