The polymer supported palladium catalyst (Pd-pol) obtained by reaction between Pd(AAEMA)(2), [AAEMA(-)= deprotonated form of 2-acetoacetoxy(ethylmetacrylate)], ethyl methacrylate (comonomer) and ethylene glycol dimethacrylate (cross-linker) has been used in the Heck coupling of aryl iodides and bromides with various olefins. Under phosphine-free conditions and using two equivalents of base, the catalyst, which is air stable and resistant to water washings, could be recycled at least five times without loss of activity and selectivity. The analysis of the mother liquors at different conversion values indicates that little amount of palladium is leached out during each cycle and that the catalytic phenomenon is mainly homogeneous.
A New Polymer Supported Palladium Complex as Active, Air Stable and Recyclable Catalyst for Carbon-Carbon Bond Forming Reactions / Dell'Anna, Maria Michela; Mastrorilli, Pietro; F., Muscio; C. F., Nobile (STUDIES IN SURFACE SCIENCE AND CATALYSIS). - In: Science and technology in catalysis 2002: proceedings of the fourth Tokyo Conference on Advanced Catalytic Science and Technology, Tokyo, July 14-19, 2002 / [a cura di] Masakazu Anpo, Makoto Onaka, Hiromi Yamashita. - STAMPA. - Tokyo, Japan : Kodansha Elsevier, 2003. - ISBN 9780444513496. - pp. 133-136 [10.1016/S0167-2991(03)80178-7]
A New Polymer Supported Palladium Complex as Active, Air Stable and Recyclable Catalyst for Carbon-Carbon Bond Forming Reactions
DELL'ANNA, Maria Michela;MASTRORILLI, Pietro;
2003-01-01
Abstract
The polymer supported palladium catalyst (Pd-pol) obtained by reaction between Pd(AAEMA)(2), [AAEMA(-)= deprotonated form of 2-acetoacetoxy(ethylmetacrylate)], ethyl methacrylate (comonomer) and ethylene glycol dimethacrylate (cross-linker) has been used in the Heck coupling of aryl iodides and bromides with various olefins. Under phosphine-free conditions and using two equivalents of base, the catalyst, which is air stable and resistant to water washings, could be recycled at least five times without loss of activity and selectivity. The analysis of the mother liquors at different conversion values indicates that little amount of palladium is leached out during each cycle and that the catalytic phenomenon is mainly homogeneous.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
