Analysis of the concerted metalation-deprotonation mechanism in palladium-catalyzed direct arylation across a broad range of aromatic substrates.

The concerted metalation-deprotonation mechanism predicts relative reactivity and regioselectivity for a diverse set of arenes spanning the entire spectrum of known palladium-catalyzed direct arylation coupling partners. An analysis following an active strain model provides a more complete portrayal of the important arene/catalyst parameters leading to a successful coupling. The breadth of arenes whose reactivity can be predicted by the CMD mechanism indicates that it may be far more widespread than previously imagined.