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A novel three‐component catalyst CuO/oxalyldihydrazide/hexane‐2,5‐dione was a very convenient, economic, and effective catalytic system for the Ullmann‐type C–N coupling reaction in water. Both aryl bromides and aryl iodides could be aminated by a variety of amines even at room temperature or with heating to afford very good isolated yields. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
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Zhu et al. (2008) studied this question.
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