Abstract
A novel tetraimidazolium salt based on a porphyrin as a ligand was synthesized and evaluated as a precursor of an N-heterocyclic carbene ligand and PdCl2(CH3CN)2 as the palladium source in Suzuki cross-coupling reactions with aryl halides and arylboronic acids. Among the bases and solvents tested, KOH and ethanol were the most effective. The tetraimidazolium salt exhibited excellent activity in Suzuki coupling reactions at room temperature over 1 h. The results indicate that catalytic activities are dependent on the collective effect of the porphyrin core and the NHC. The new porphyrin-based imidazolium salt shows promise as a supermolecular skeleton for the construction of highly active catalysts.
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