Palladium–tetraphosphine catalysed cross coupling of aryl bromides with arylboronic acids: remarkable influence of the nature of the ligand

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Abstract
The cis,cis,cis-1,2,3,4-Tetrakis(diphenylphosphinomethyl)cyclopentane –[PdCl(C3H5)]2 system catalyses the cross coupling of aryl bromides with arylboronic acids with very high substrate–catalyst ratios in good yields; a turnover number of 28000000 can be obtained for the addition of 4-bromobenzophenone to benzeneboronic acid in the presence of this catalyst.