Using High-Power UV-LED to Accelerate a Decatungstate-Anion-Catalyzed Reaction: A Model Study for the Quick Oxidation of Benzyl Alcohol to Benzoic Acid Using Molecular Oxygen
Mamoru Hyodo,
Hitomi Iwano,
Takayoshi Kasakado,
Takahide Fukuyama,
Ilhyong Ryu
Affiliations
Mamoru Hyodo
Organization for Research Promotion, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
Hitomi Iwano
Organization for Research Promotion, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
Takayoshi Kasakado
Organization for Research Promotion, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
Takahide Fukuyama
Department of Chemistry, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
Ilhyong Ryu
Organization for Research Promotion, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
High-power UV-LED irradiation (365 nm) effectively accelerated the decatungstate-anion-catalyzed oxidation of benzyl alcohol 1 to benzoic acid 3 via benzaldehyde 2. As the power of the UV-LED light increased, both the selectivity and yield of benzoic acid also increased. The reaction was finished within 1 h to give 3 in a 93% yield using 2 mol% of decatungstate anion catalyst. The combination of a flow photoreactor and high-power irradiation accelerated the oxidation reaction to an interval of only a few minutes.
