Four tethered titanocene complexes were covalently immobilized onto 3-mercaptopropyl-functionalized silica gel. We have investigated the influence of the length of the tether and of the ansa-bridge on the activity in the heterogeneous hydrosilylation of the cyclic imine 2-phenylpyrroline, taken as an illustrative example. Possible metal leaching during the reaction was investigated using ICP/OES, recycling studies and the three-phase test. The novel immobilized catalysts exhibit an activity similar to their homogeneous analogues in the tested hydrosilylation reactions with a TOF of [similar]20 h−1. Furthermore, our results indicate that metal leaching is negligible under the applied reaction conditions.

Tethered ansa-bridged titanium complexes immobilized on 3-mercaptopropyl-functionalized silica gel and their application for the hydrosilylation of imines

POLO, Eleonora;
2012

Abstract

Four tethered titanocene complexes were covalently immobilized onto 3-mercaptopropyl-functionalized silica gel. We have investigated the influence of the length of the tether and of the ansa-bridge on the activity in the heterogeneous hydrosilylation of the cyclic imine 2-phenylpyrroline, taken as an illustrative example. Possible metal leaching during the reaction was investigated using ICP/OES, recycling studies and the three-phase test. The novel immobilized catalysts exhibit an activity similar to their homogeneous analogues in the tested hydrosilylation reactions with a TOF of [similar]20 h−1. Furthermore, our results indicate that metal leaching is negligible under the applied reaction conditions.
2012
Gruber Wölfler, H.; Neubauer, C.; Lichtenegger, G. J.; Polo, Eleonora; Khinast, J.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1824506
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