Abstract
The selective oxidation of benzylic alcohols was performed by using commercially available aluminum oxy-hydroxide-supported palladium (Pd/AlO(OH)) nanoparticles (0.5 wt.% Pd, about 3 nm size) under mild conditions. The oxidation method comprises the oxidation of benzyl alcohols catalyzed by aluminum oxy-hydroxide-supported palladium under ultrasonic and solvent-free conditions and a continuous stream of O2. The characterization of aluminum oxy-hydroxide-supported palladium nanocatalyst was conducted by several advanced analytical techniques including scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), and elemental analysis by ICP-OES. The oxidation of a variety of benzyl alcohol compounds were tested by the aluminum oxy-hydroxide-supported palladium nanoparticles, and all expected oxidation products were obtained by the high conversion yields within 3 hours. The reaction progress was monitored by TLC (Thin-layer chromatography), and the yields of the products were determined by 1H-NMR and 13C NMR analysis.
Highlights
The carbonyl compounds obtained by the oxidation of alcohol compounds are important intermediates used in the production of new molecules in both chemistry and industry
By the use of molecular oxygen, the alcohol compounds are oxidized to carbonyl compounds, and the water molecule is formed in the medium (Fig. 2)
The support (AlO(OH)) used in the catalyst has a basic character, which provides an auxiliary role for the KOH used in this study. It can be employed for the oxidation of benzylic alcohols to benzaldehyde derivatives
Summary
The carbonyl compounds obtained by the oxidation of alcohol compounds are important intermediates used in the production of new molecules in both chemistry and industry. The oxidation method used in this study comprises the oxidation of primary alcohols catalyzed by aluminum oxy-hydroxide-supported palladium nanoparticles under ultrasonic and solvent-free conditions. Various benzylic alcohol compounds were tested with aluminum oxy-hydroxide supported palladium nanoparticles, obtained with recovery’s efficiency of up to 99% of all expected oxidation products over 180 min.
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