Journal
APPLIED CATALYSIS A-GENERAL
Volume 616, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcata.2021.118107
Keywords
One-pot cascade approach; Bifunctional catalyst; Aldol condensation; Hydrogenation; Pd; ZrO2; 2-Alkyl cycloketone
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Funding
- National Natural Science Foundation of China [21802135]
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A batch one-pot cascade approach using a bifunctional Pd/ZrO2 catalyst was developed for the synthesis of 2-alkyl cycloketones, achieving high conversion and yield at mild temperature. The catalyst showed slight deactivation after 10 cycles of reuse, but its performance was completely recovered after an oxidative regeneration.
2-Alkyl cycloketones are essential chemicals and intermediates for synthetic perfumes and pesticides, which are conventionally produced by multistep process including aldol condensation, separation and hydrogenation. In present work, a batch one-pot cascade approach using aldehydes and cycloketones as the raw materials, and a bifunctional Pd/ZrO2 catalyst was developed for the synthesis of 2-alkyl cycloketones, e.g., cyclohexanone and cycloheptanone. Very high aldehydes (except for paraldehyde with large steric hindrance) conversion and high yields for 2-alkyl cycloketones (e.g., 99 % of conversion for n-butanal and 76 wt.% of yield for 2-butyl cyclohexanone) were obtained at mild temperature of 140 ?C. After 10 cycles of reuse, Pd/ZrO2 catalyst showed slight deactivation (ca. 5 % conversion and 10 % yield losses), due to the coke on the catalyst. However, the performance of the catalyst was completely recovered after an oxidative regeneration.
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