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The N2,N2′‐diisopropyloxalohydrazide/CuO system efficiently catalyzed the direct amination of aryl bromides andiodides with aqueous ammonia in water at 60 °C in 24 h or at 120 °C in only 20–30 min. Both activated and unactivated aryl and heteroaryl bromides and iodides were readily aminated in good to excellent yields.
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