Journal
CHEMSUSCHEM
Volume 10, Issue 17, Pages 3482-3489Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201701016
Keywords
alkenes; heterogeneous catalysis; oxidation; palladium; size effect
Funding
- ALCA program of the Japan Science and Technology Agency
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Highly efficient Wacker oxidation of aromatic or aliphatic terminal alkenes into methyl ketones and benzofurans is developed by using reusable Pd-0 nanoparticles (NPs) supported on ZrO2 under acid- and cocatalyst-free conditions. Molecular oxygen or air can be utilized as the terminal oxidant, which results in the formation of H2O as the only theoretical byproduct. The activation of the Pd NPs by O-2 plays an important role in promoting this reaction. Interestingly, PdO supported on ZrO2 showed no activity. Additionally, the Pd particle size significantly affects the catalytic activity, with an apparent optimal diameter of 4-12nm. In addition to the heterogeneous catalyst forms, the Pd NPs can be generated from a Pd-0 complex during the reaction, and these particles are even recyclable.
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