PdII-loading alumina catalyst, which is simply prepared through impregnation of γ–alumina with Pd(OAc)2 followed by calcination in the air, shows a high catalytic activity for the Suzuki coupling of aryl bromides with arylboronic acids under phosphine ligand-free conditions. Only 0.25 mol % of palladium is sufficient for the promotion of the couplings in ethanol.
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Kudo et al. (2007) studied this question.
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