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Abstract
A series of complex compounds that contain N-heterocyclic carbene (NHC) and N-heterocyclic carbene ligands with a remote heteroatom ( rNHC) have been prepared in good yields and characterized. [Cl(NHC)(PPh 3) 2Ni]BF 4 and [Cl( rNHC)(PPh 3) 2Ni]BF 4 also combine the stability of carbene complexes with the activity of phosphine complexes and some are active and effective precatalysts for aryl-coupling in the Kumada–Corriu reaction. Aryl chlorides can be used as substrates. Their performance in catalysis as well as their easy preparation make the new compounds superior to other comparable mixed carbene–phosphine compounds known thus far.
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