Interplays between Reactions within and without the Catalytic Cycle of the Heck Reaction as a Clue to the Optimization of the Synthetic Protocol

Abstract
This account presents previous and recent mechanistic studies of the Heck reactions reported by the authors whose attention has been focused on a problem of the coupling of catalyst transformations within and without the catalytic cycle. Based on the understanding of the interaction mechanism between these processes a development of new methods of Heck chemistry became conceivable. In particular, such a rational approach allowed an elaboration of the ligand-free systems, which are effective not only in the reaction with non-activated aryl bromides but also with non-activated aryl chlorides.

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