Sustainable and recyclable heterogenous palladium catalysts from rice husk-derived biosilicates for Suzuki-Miyaura cross-couplings, aerobic oxidations and stereoselective cascade carbocyclizations.

ABSTRACT: A new eco-friendly approach for the preparation of sustainable heterogeneous palladium catalysts from rice husk-derived biogenic silica (RH_P-Si and RH_U-Si). The designed heterogeneously supported palladium species (RH_P-Si-NH₂-Pd and RH_U-Si-NH₂-Pd) were fully characterized and successfully employed as catalysts for various chemical transformations (C-C bond-forming reactions, aerobic oxidations and carbocyclizations). Suzuki-Miyaura transformations were highly efficient in a green solvent system (H₂O:EtOH (1:1) with excellent recyclability, providing the cross-coupling products with a wide range of functionalities in high isolated yields (up to 99%). Palladium species (Pd(0)-nanoparticles or Pd(II)) were also effic

SUBMITTER: Afewerki S 

PROVIDER: S-EPMC7156381 | biostudies-literature | 2020 Apr

REPOSITORIES: biostudies-literature