Rhodium-complexed hyperbranched poly(ethyleneimine) and polyamidoamine and their non-covalent immobilization on magnetic nanoparticlesnn

摘要

We describe a synthetic strategy for the synthesis and functionalization of hyperbranched poly(-ethyleneimine) (H-PEI) and polyamidoamine (H-PAMAM) with phosphine ligands and their noncovalent immobilization on magnetic nanosupports. Treatment of these functionalized hyperbranched polymers with Rh(COD)(2)BF4 affords polymer-bound Rh(I) complexes that can be utilized in the hydroformylation of alkenes and in one pot hydroformylation-Knoevenagel-hydrogenation reactions. These functionalized hyperbranched polymers are linked to magnetic nanoparticles that are modified with carboxylic acid groups via ionic interactions resulting from the acid-base reactions, and are responsible for facilitating the separation of the polymeric catalysts. These magnetically retrievable polymeric catalysts can be reused for up to four cycles. (C) 2016 Elsevier B.V. All rights reserved.