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α,β-Desaturation of Ketones Catalyzed by Palladium(II) on Gold Nanoparticles Supported on Ceria
CeO2‑Supported Pd(II)-on-Au Nanoparticle Catalyst for Aerobic Selective α,β-Desaturation of Carbonyl Compounds Applicable to Cyclohexanones.
ACS Catal. 2020;
21 July 2020 (online)
Key wordspalladium catalysis - gold catalysis - desaturation cyclohexanones - cyclohexenones - dioxygen
Palladium(II) on gold nanoparticles supported on CeO2 (Pd/Au/CeO2) was prepared according to equation 1. Pd/Au/CeO2 catalyzed the desaturation of ketones 1 under open-air conditions to give the corresponding α,β-unsaturated ketones 2 in up to >99% yield (eq. 2).
Pd/Au/CeO2 was characterized by XPS, XANES, XRD, HAADF-STEM, STEM-EDS and ICP-AES analyses. In the desaturation of cyclohexanone (1a) to cyclohex-2-en-1-one (2a), the catalyst showed a high turnover frequency (122 h–1 based on Pd). This catalysis offers a viable alternative to the Saegusa–Ito oxidation.