2019•Asian Journal of ChemistryOpen access

Catalytic Hydrogenation of Cinnamic Acid and Salicylic Acid

Sunil B. Shinde, Raj Madhukar Deshpande

Abstract

Hydrogenation of cinnamic acid and salicylic acid was carried out using 5 %Ru/C, 5 % Pd/C and Ru-Sn/Al2O3 catalyst at 493 K and 6.89 MPa of hydrogen partial pressure. Ru-Sn/Al2O3 catalyst was found to be active for hydrogenation -COOH group to give cinnamyl alcohol. The selectivity to cinnamyl alcohol was low (15 %) as absolute inhibition of C=C bond hydrogenation in cinnamic acid is challenging. 5 %Pd/C catalyst was found to hydrogenate C=C bond and aromatic ring in cinnamic acid. 5 %Ru/C catalyst was found to be least selective catalyst as it hydrogenated C=C bond, aromatic ring and -COOH group in cinnamic acid. Hydrogenation of salicylic acid is not possible at 493 K as decarboxylation of salicylic acid occurs.

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Key concepts: Cinnamyl alcohol, Chemistry, Cinnamic acid, Salicylic acid, Catalysis, Decarboxylation, Alcohol, Organic chemistry