Palladium nanoparticles heterogeneous nucleation within organically grafted silica foams and their use as catalyst supports toward the Suzuki–Miyaura and Mizoroki–Heck coupling reactions

Palladium nanoparticles supported within hybrid organic–inorganic foams have been generated. The as-synthesized catalysts, labeled “Pd@gOrgano-Si(HIPE)” (high internal phase emulsion), have been tested with or without addition of triphenylphosphine (PPh3), considering both the Suzuki–Miyaura and Mizoroki–Heck coupling reactions. Particularly, the catalysts Pd@gMercapto-Si(HIPE)-P4 and Pd@g3Amino-Si(HIPE)-P4 under addition of (PPh3) in a molar ratio 4:1 relative to palladium, are offering good yields, turnover and cycling performances for the Mizoroki–Heck coupling reaction.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (120 K)Download as PowerPoint slideResearch highlights▶ Palladium nanoparticles have been heterogeneously nucleated within hybrid organic–inorganic foams. ▶ The new as-synthesized “Pd@organo-Si(HIPE)” open-cell catalysts have been tested for the Suzuki–Miyaura and Mizoroki–Heck coupling reactions. ▶ Thiphenylphosphine (PPh3) is favouring nanoparticles stabilization and activation. ▶ The catalysts Pd@gMercapto-Si(HIPE)-P4 and Pd@g3Amino-Si(HIPE)-P4 under addition of (PPh3) are offering high yields, turnover and cycling performances for the Mizoroki–Heck coupling reaction.