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Vol. 33 No. 4 (2021): Vol 33 Issue 4

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Carbon Molecular Sieve Supported Pd Catalyzed Hydrogenation of Cinnamaldehyde in Alkaline Medium

https://doi.org/10.14233/ajchem.2021.23080
Racharla Krishna
Defense R&D Establishment, Jhansi Road, Gwalior-474002, India ; Department of Genetics & Biotechnology, Osmania University, Hyderabad-500007, India
Chowdam Ramakrishna
Defense Research and Development Laboratory, Hyderabad-5000058, India
Bijendra Saini
Defense R&D Establishment, Jhansi Road, Gwalior-474002, India
Thakkallapalli Gopi
Defense R&D Establishment, Jhansi Road, Gwalior-474002, India
Gujarathi Swetha
Defense R&D Establishment, Jhansi Road, Gwalior-474002, India
Sridara Chandra Shekhar
Defense R&D Establishment, Jhansi Road, Gwalior-474002, India
Ankanagari Srinivas
Department of Genetics & Biotechnology, Osmania University, Hyderabad-500007, India

Corresponding Author(s) : Sridara Chandra Shekhar

chem.krishna24@gmail.com

Asian Journal of Chemistry, Vol. 33 No. 4 (2021): Vol 33 Issue 4

Abstract

Synthesis of various fine chemicals and pharmaceuticals are regulated through selective hydrogenation of α,β-unsaturated aldehydes. Hydrocinnamaldehyde is one of the important compounds in perfumery and flavouring industries. It is highly precarious and challenging to control the product selectivity as well as conversion in cinnamaldehyde hydrogenation. In this study, an effective hydrogenation of cinnamaldehyde was attained in presence of aqueous-protic organic medium by utilizing Pd/CMS and other additives of alkali such as K2CO3. The Pd/CMS catalyst along with alkali media catalyzed the hydrogenation of C=C selectively in cinnamaldehyde in order to form hydrocinnamaldehyde with 100% conversion rate. Additionally, the parallel hydrogenation of C=O and C=C bonds in cinnamaldehyde takes place in absence of media. The C=O bond reduction in cinnamaldehyde can be restricted through K2CO3 addition to aqueous-protic solution. The active sites of palladium were found to be uniform and analyzed using HRTEM data. Based on the mechanism involved in micropores of carbon molecular sieves, the key role of promoter is associated with hydrogenation of cinnamaldehyde. The catalytic criterion was appropriate with the acquired activity data.

Keywords

Alkali carbonate Hydrocinnamaldehyde Cinnamaldehyde CMS supported Pd catalyst Hydrogenation
Krishna, R., Ramakrishna, C., Saini, B., Gopi, T., Swetha, G., Chandra Shekhar, S., & Srinivas, A. (2021). Carbon Molecular Sieve Supported Pd Catalyzed Hydrogenation of Cinnamaldehyde in Alkaline Medium. Asian Journal of Chemistry, 33(4), 846–852. https://doi.org/10.14233/ajchem.2021.23080
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