Light Mediated Preparation of Palladium Nanoparticles as Catalysts for Alkyne <i>cis</i>-Semihydrogenation

A bisacylphosphine oxide photoinitiator was used for the light mediated preparation of palladium nanoparticles (PdNPs) with a small diameter of 2.8 nm. All starting materials are commercially available, and PdNP synthesis is experimentally very easy to conduct. The PdNP-hybrid material was applied as catalyst for the semihydrogenation of various internal alkynes to provide the corresponding alkenes in excellent yields (up to 99%) and <i>Z</i>-selectivities (<i>Z</i>/<i>E</i> ratios up to 99/1)

Visible-Light-Enabled Preparation of Palladium Nanoparticles and Application as Catalysts for Suzuki–Miyaura Coupling

Silyl ketones were used for the preparation of palladium nanoparticles (PdNPs) starting with Pd­(OAc)₂ in dimethylformamide under irradiation with a visible light-emitting diode (LED). Variation of the silyl ketone structure allowed adjustment of the PdNP diameter (1.9 or 5.2 nm). The in situ-formed PdNPs were further stabilized with polyvinylpyrrolidone and then applied as recyclable catalysts in the Suzuki–Miyaura coupling of arylboronic acids with aryl iodides to obtain substituted biphenyls in excellent yields