Abstract
A nickel(0)/tetra-n-butylammonium bromide (TBAB) catalyzed Suzuki-Miyaura reaction of aryl iodides and bromides with organoboronic acids was developed under phosphine-free reaction conditions. The reaction involved the use of ethanol as solvent, sodium carbonate as base, and nickel metal colloids stabilized by TBAB as catalyst. For activated aryl chlorides, excellent yields of the products were isolated when PPh 3 was added to the reaction. Furthermore, the nickel metal could be recovered and recycled for six consecutive trials without significant loss of its reactivity.
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