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Synfacts 2009(1): 0102-0102
DOI: 10.1055/s-0028-1087247
DOI: 10.1055/s-0028-1087247
Polymer-Supported Synthesis
© Georg Thieme Verlag
Stuttgart ˙ New York
Coupling of Phenols and Aryl Halides with Nano-Copper Oxide
J. Zhang, Z. Zhang, Y. Wang, X. Zheng*, Z. Wang*
University of Science and Technology of China, Hefei, P. R. of China
Weitere Informationen
Publikationsverlauf
Publikationsdatum:
18. Dezember 2008 (online)

Significance
Nanocrystalline copper oxide (nano-CuO) catalyzed the Ullmann coupling of phenols with aryl halides in the presence of Cs2CO3 or KOH to afford the corresponding diaryl ethers in up to 94% yield (18 examples). In the reaction of 4-methoxyphenol with iodobenzene, the catalyst was recovered by simple centrifugation and reused four times without loss of catalytic activity. TEM analysis showed almost no changes of the shape and size of the catalyst after the 4th run.