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Phosphorus Functionalized Dendrimers and Hyperbranched Polymers: Is There a Need for Perfect Dendrimers in Catalysis?
Author(s) -
Ribaudo Fabrizio,
Van Leeuwen Piet W. N. M.,
Reek Joost N. H.
Publication year - 2009
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1560/ijc.49.1.79
Subject(s) - chemistry , dendrimer , allylic rearrangement , palladium , catalysis , thiophenol , macromolecule , nucleophile , polymer , combinatorial chemistry , polymer chemistry , surface modification , organic chemistry , biochemistry
In this paper we describe the facile and straightforward covalent functionalization of commercially available dendritic poly(propylenimine) and hyper‐branched poly(ethylenimine) with P‐containing functional groups. The P‐functionalized macromolecules have been applied as multivalent ligands in the Pd‐catalyzed allylic substitution reactions (batch and continuous process) using either morpholine or thiophenol as nucleophile. Palladium complexes of all described molecules are active in allylic substitution reactions. The PEI functionalized polymers appear more sensitive to small changes in the P/Pd ratio than the PPI analogues, but form catalysts that are more active. When used in a continuous flow process the macromolecules are completely retained by the nanofiltration membrane, while the catalytic activity decreases with time because of palladium depletion. This is more severe for the allylic thiolation, probably because of the stronger affinity of sulfur for palladium, facilitating palladium leaching.