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Synfacts 2007(10): 1103-1103  
DOI: 10.1055/s-2007-968966
Polymer-Supported Synthesis
© Georg Thieme Verlag Stuttgart · New York

Palladium on Mesoporous Organosilica

Contributor(s): Yasuhiro Uozumi, Hiroe Takenaka
Y. Wan*, D. Zhang, Y. Zhai, C. Feng, J. Chen, H. Li *
Shanghai Normal University and Fudan University, Shanghai, P. R. of China
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Publication History

Publication Date:
07 November 2007 (online)

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Significance

Phenylene-containing mesoporous organosilica, Ph-PMO, prepared from 1,4-bis(triethoxysilyl)benzene is known as an organic-inorganic hybridized composite bearing highly ordered periodic honeycomb (hexagonal) structures. A palladium species was impregnated inside Ph-PMO and the resulting Pd/Ph-PMO was used as a catalyst for the Ullmann-type homocoupling of halobenzenes in water. The coupling reactions of PhI and PhBr were promoted by Pd/Ph-PMO in water at 100 °C in the presence of HCOONa with excellent selectivity to give 94% and 91% yields of biphenyl, respectively.