The resting state of the gold(I)-catalyzed hydroarylation of 1 changes in the presence of Ag(+), with silver free catalysts resting at the dinuclear gold structure 5 and Ag(+) containing solutions resting at a heteronuclear species like 6. Adventitious Ag(+) (typically from LAuCl activation) can therefore intercept key organogold intermediates and effect the catalysis even when it does not effect the reaction in Au free control experiments.
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Weber et al. (2009) studied this question.
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