Palladium-catalyzed decarboxylative allylation (DcA) is a well-established method of
carbon-carbon bond formation. This type of coupling is quite attractive, as the only byproduct is
CO2. While a wide variety of ligands have been employed with Pd(0) or Pd(II) precatalysts in DcA
reactions, the ligand structure is most often based on a triarylphosphine core. Despite their
demonstrated utility, DcA processes have been hindered by the formation of protonation side
products. While this phenomenon has been widely acknowledged, little has been reported on
the origin of the proton. Herein, we address this and provide multiple lines of experimental
evidence for the proton originating from the triarylphosphine ligand. <br>
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