In our previous work, the catalysis of the isomerization of allyl alcohols to their analog carbonyl compounds was achieved by using palladium nanoparticle catalysts generated from sodium S-dodecylthiosulfate. In these reactions, allyl alcohols were introduced to the homogeneous palladium nanoparticle solution in chloroform upon the completion of hydrogen conditioning. Although the reactions were very selective and successful, the separation between the palladium nanoparticle catalysts and the volatile products was quite problematic. In this study, palladium nanoparticles were synthesized with Bunte Salts which contained polar functional groups (Bunte Salts of w-hexylcarboxylate, w-undecylcarboxylate, and oligoethylene glycol) in order to increase the solubility of the palladium nanoparticles in aqueous solution. Palladium nanoparticles were characterized by transmission electron microscopy (TEM), thermogravimetric analysis (TGA), 1H NMR, FT-IR and UV-Vis spectroscopy. By changing the solubility of palladium nanoparticles and working the catalytic reactions under the heterogeneous condition, the separation of the products and the palladium nanoparticle catalysts became fairly efficient. In addition, two-phase catalytic reactions were also studied for the effective separation of the palladium nanoparticle catalysts dissolved in aqueous solution from the organic phase containing the products. Catalytic reactions were performed by conditioning 5 mol% palladium nanoparticle catalysts with hydrogen gas in both heterogeneous and two-phase systems.

Heterogeneous and two-phase catalysis by water-soluble palladium nanoparticles generated from Bunte Salts

243rd National Meeting (2012)

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