Journal
SYNLETT
Volume -, Issue 17, Pages 2747-2750Publisher
GEORG THIEME VERLAG KG
DOI: 10.1055/s-2006-950260
Keywords
nanocrystalline magnesium oxide; palladium; heterogeneous reaction; Heck reaction; Sonogashira reaction
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Nanocrystalline magnesium oxide supported palladium(0) catalyst [NAP-Mg-Pd(0)], prepared by the counter-ion stabilization of PdCl42- followed by reduction with hydrazine hydrate, was effectively used in the Heck olefination of haloarenes (chloro, bromo, and iodo) to afford good to excellent yields of substituted olefins. This ligand-free heterogeneous NAP-Mg-Pd(0) catalyst was quantitatively recovered from the reaction by a simple filtration and reused for a number of cycles with almost no loss of activity. Moreover, NAP-Mg-Pd(0) efficiently catalyzed the Sonogashira coupling of haloarenes with terminal alkynes without any copper co-catalyst under milder conditions to afford excellent yields of substituted alkynes.
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