Abstract
A catalytic system utilizing a chelate carbene ligand containing bulk <i>tert</i>-butyl groups is described for palladium-catalyzed Heck and Suzuki coupling reactions. The Heck reaction focused on the coupling of different aryl bromides with mono- and 1,1-disubstituted olefins while the Suzuki reaction involved the coupling of aryl bromides and phenylboronic acid to afford the corresponding biphenyls. The catalyst system performs well with low Pd(OAc)<sub>2</sub> levels (0.025 mol% Pd). In all cases with monosubstituted olefins, the <i>trans</i>-configured products were obtained, while the results of Heck reaction of 1,1-disubstituted olefins exhibited a high selectivity favoring the terminal product.
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