Journal
JOURNAL OF ORGANOMETALLIC CHEMISTRY
Volume 691, Issue 13, Pages 3027-3036Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jorganchem.2006.03.012
Keywords
Mizoroki-Heck reaction; C-C coupling; heterocyclic carbene; immobilized palladium; heterogeneous catalyst; palladium leaching
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A saturated Pd-N-heterocyclic complex was immobilized on an amorphous silica. The complex itself is of very high thermal stability. However, TEM observations, hot filtration, reusability, and poisoning tests all revealed that the complex acted only as a precatalyst to highly active Pd species in Mizoroki-Heck reactions when immobilized. The complex appears more stable when used under homogeneous reaction conditions. The immobilized complex afforded high turnover numbers, 10(4)-10(5). The higher turnover frequencies were realized at the lower Pd concentrations, which is a characteristic property of ligand-free Pd catalyzed reactions. (c) 2006 Elsevier B.V. All rights reserved.
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