Light-Induced Sonogashira CC Coupling under Mild Conditions Using Supported Palladium Nanoparticles [component]

The Sonogashira reaction can easily be photocatalysed by supported palladium nanoparticles. We demonstrate that the direct excitation of the PdNPs can catalyze the C-C coupling between different aryl iodides and acetylenes under very mild conditions in short reaction times. The catalyst is air and moisture tolerant and can be supported in a wide range of materials, including inert ones such as nanodiamonds. Study of the action spectrum demonstrates that direct excitation of the PdNP is
more » ... and for example in the case of Pd@TiO2 visible excitation works well, while UVA (368 nm) is ineffective due to TiO2 shielding of the Pd absorption. The catalyst can be reused a couple of times, but when it loses activity it can be readily reactivated via a simple reductive photochemical strategy.
doi:10.1021/acssuschemeng.7b02992.s001 fatcat:kh7u3lb23rhwdpobxtu3logu3q