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Three PPh 2 functionalities, immobilised through a C2 (1), C3 (2), and C5 (3) spacer onto silica, have been studied for their capacity to recover Wilkinson's catalyst. A low surface concentration of the ligand together with a short spacer arm gave the best recovery results, as under these conditions the formation of stable RhL 2 and Rh 2 L 2 complexes is precluded....
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