Efficient ligand-free Hiyama cross-coupling reaction catalyzed by functionalized SBA-15-supported Pd nanoparticles

Autor:	Chia-Min Yang, Shao-Hsien Huang, Chun-Hsia Liu
Rok vydání:	2014
Předmět:	inorganic chemicals Nanocomposite Trimethylsilyl Chemistry Ligand organic chemicals Aryl Photochemistry Pollution Coupling reaction Catalysis chemistry.chemical_compound Polymer chemistry Environmental Chemistry Surface modification Mesoporous material
Zdroj:	Green Chem.. 16:2706-2712
ISSN:	1463-9270 1463-9262
Popis:	A ligand-free Hiyama cross-coupling reaction catalyzed by functionalized SBA-15-supported Pd catalysts has been developed. The catalysts were prepared by depositing Pd nanoparticles preferentially in the micropores of the SBA-15 with hydrophobic trimethylsilyl or triphenylsilyl groups grafted on the mesopores. The nanocomposite catalysts showed excellent activities for the cross-coupling between various aryltriethoxysilanes and aryl halides under relatively mild (at 100 °C in air) reaction conditions. Moreover, the hydrophobic functionalization rendered the catalysts reusable without showing significant activity loss. The decreased activity after successive catalytic runs was attributed to a low level of Pd-leaching and a gradual collapse of mesopores of host silica. The cross-coupling protocol with the designed catalysts would be practical for use as an economical synthetic method for the construction of biphenyl derivatives.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b63ffdf5782ddb5777ce60bb030ae567 https://doi.org/10.1039/c4gc00141a Zobrazit plný text záznamu