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Selective Heck Arylation of Cyclohexene with Homogeneous and Heterogeneous Palladium Catalysts.
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- المؤلفون: Mieczyńska, Ewa1 ; Trzeciak, Anna M.1
- المصدر:
Molecules. Apr2010, Vol. 15 Issue 4, p2166-2177. 12p. 1 Black and White Photograph, 2 Diagrams, 3 Charts, 3 Graphs.
- الموضوع:
- معلومة اضافية
- نبذة مختصرة :
Palladium catalysts containing Pd(II) supported on Al2O3 and alumina-based mixed oxides, Al2O3-ZrO2, Al2O3-CeO2, and Al2O3-Fe2O3, are very effective in the Heck coupling of iodobenzene with cyclohexene in DMF solution. The best results, up to 81% of monoarylated products with a selectivity to 4-phenylcyclohexene (3) close to 90% were obtained with KOH as a base. The catalytic activity of palladium supported on aluminabased oxides was compared with that of homogeneous precursors, such as Pd(OAc)2 and PdCl2(PhCN)2, used in [Bu4N]Br as the reaction medium. Under such conditions homogeneous systems were more selective and produced up to 60% of monoarylated products with a selectivity to 3 close to 60%. [ABSTRACT FROM AUTHOR]
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