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Sustainable and recyclable heterogenous palladium catalysts from rice husk-derived biosilicates for Suzuki-Miyaura cross-couplings, aerobic oxidations and stereoselective cascade carbocyclizations
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för material- och miljökemi (MMK).ORCID-id: 0000-0001-7286-1211
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Antal upphovsmän: 62020 (Engelska)Ingår i: Scientific Reports, E-ISSN 2045-2322, Vol. 10, artikel-id 6407Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A new eco-friendly approach for the preparation of sustainable heterogeneous palladium catalysts from rice husk-derived biogenic silica (RHP-Si and RHU-Si). The designed heterogeneously supported palladium species (RHP-Si-NH2-Pd and RHU-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 efficient catalysts in the green aerobic oxidation of an allylic alcohol and a co-catalytic stereoselective cascade carbocyclization transformation. In the latter case, a quaternary stereocenter was formed with excellent stereoselectivity (up to 27:1 dr).

Ort, förlag, år, upplaga, sidor
2020. Vol. 10, artikel-id 6407
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Kemi
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URN: urn:nbn:se:su:diva-185659DOI: 10.1038/s41598-020-63083-8ISI: 000562163600004PubMedID: 32286367OAI: oai:DiVA.org:su-185659DiVA, id: diva2:1474462
Tillgänglig från: 2020-10-08 Skapad: 2020-10-08 Senast uppdaterad: 2022-09-15Bibliografiskt granskad

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Afewerki, SamsonTai, Cheuk-Wai

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