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Studies on Kojic Acid and its Related γ-Pyrone Compounds

Itsuo Ichimoto, Chuji TATSUMI

Abstract

The catalytic hydrogenation of kojic acid in the presence of Raney nickel and noble metals such as platinum or palladium was studied. The hydrogenated products were isolated and identified. By using Raney nickel catalyst, hexahydro kojic acid was obtained in good yield. Allo-maltol, hexahydro kojic acid and hexahydro allo-maltol were produced over platinum catalyst. Also, allomaltol, tetrahydro kojic acid and tetrahydro all maltol were produced over palladium catalyst. The success of the direct conversion from kojic acid to allo-maltol may be emphasized.

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Key concepts: Maltol, Kojic acid, Chemistry, Palladium, Catalysis, Raney nickel, Platinum, Organic chemistry