New linker systems for superior immobilized catalysts
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The rigid linkers E(p-C6H4PPh2) 4 (E = Si, Sn) have been synthesized from the corresponding precursors E(p-C6H4Br)4 and immobilized by forming one (E = Si) or three (E = Sn) phosphonium groups that are attached to the silica support by electrostatic interactions. The remaining unquaternized phosphines are coordinated to Wilkinson-type Rh complexes. The catalyst immobilized by the rigid scaffold with three surface-bound phosphonium groups (E = Sn) displays superior catalytic activity and lifetime with respect to the hydrogenation of dodecene. This catalyst can be recycled 30 times in a batchwise manner under standardized conditions. © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.
author list (cited authors)
Beele, B., Guenther, J., Perera, M., Stach, M., Oeser, T., & Blümel, J.