| Abstract
| - We present here a reassessment of our transition-metal free Suzuki-type coupling protocol. Webelieve that, although the reaction can be run without the need for addition of a metal catalyst,palladium contaminants down to a level of 50 ppb found in commercially available sodium carbonateare responsible for the generation of the biaryl rather than, as previously suggested, an alternativenon-palladium-mediated pathway. We present a revised methodology for Suzuki couplings usingultralow palladium concentrations for use with aryl and vinyl boronic acids and discuss the effectsof the purity of the boronic acid on the reaction.
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