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Copper-Catalyzed C-C(O)C Bond Cleavage of Monoalkylated β-Diketone: Synthesis of α,β-Unsaturated Ketones

International Journal of Organic Chemistry 2023年第2期13卷 41-49页

作者： Tony Wheellyam Pouambeka Victor N’goka narcisse nicaise obaya Guy Crépin Enoua Hubert Makomo Qian Zhan Laboratory of Plant and Life Chemistry Unit: Equipe de Chimie Organique et Analytique des Substances Bioactives Faculty of Science and Technology Marien Ngouabi University Brazzaville The Republic of Congo Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis Faculty of Chemistry Northeast Normal University Changchun China

A new and simple route for the synthesis of α,β-unsaturated ketones via cleavage of the C-C(O)C single bond of monoalkylated β-diketone has been described. The reaction was catalyzed by copper, a cheap transition metal in a weakly basic medium (K3PO4) at room temperature. To carry out this study, we first had to synthesize the monoalkylated β-diketones 1. Afterwards, α,β-unsaturated ketones 2 were obtained with high yields around 80%. Finally, all the products were characterized by 1H NMR, 13C NMR, and HRMS spectra. .

关键词： Monoalkylated β-diketone α β-Unsaturated Ketones Copper-Catalyzed C-C(O)C Bond Cleavage

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Valorization of Cucurbita pepo Seed Oil in Soap Production

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Green and Sustainable Chemistry 2022年第4期12卷 104-117页

作者： Guy Crépin Enoua Aristide H. W. Nakavoua Victor N’goka Tony Wheellyam Pouambeka Prince Maho Diafouana Mahoungou narcisse nicaise obaya Alain Brice Mbozo Vouidibio Hubert Makomo Robin Pascal Ongoka Analytical Chemistry and Bioactive Substances Team Faculty of Science and Technology Marien Ngouabi University Brazzaville Republic of Congo Department of Natural Sciences Normal High School Marien Ngouabi University Brazzaville Republic of Congo Laboratory of Natural Substances Chemistry (IRSEN) Brazzaville Republic of Congo Cellular and Molecular Biology Laboratory (BCM) Marien Ngouabi University Brazzaville Republic of Congo

The present study was conducted with the aim of extracting and characterising Cucurbita pepo seed oil and then producing soap with important dermatological properties. The physico-chemical results of the Cucurbita pepo seed oil after extraction were satisfactory and indicate that the oil obtained contains long-carbonaceous fatty acids. The production of the soap was based on the realisation of a saponification reaction by reflux heating between the extracted oil and a solution of soduim hydroxyde 7M for one hour. The soap obtained is characterised by the following physico-chemical parameters: salt content, alkali content, pH, and humidity;which meet ISO 684-1974 standards. The antibacterial parameters of the soaps S1, S2, S3, S4, S5 and S6 were determined by the Agar Diffusion test using the well method and these soaps showed an interesting antibacterial activity against the germs pseudomonas aeruginosa and staphylococcus aureus. Soaps based on Raffia sese oil (kolo oil) and Elaesis guineensis oil (palm oil) have also been synthesized for comparison with soap obtained from Cucurbita pepo seed oil.

关键词： Valorization Cucurbita pepo Seeds Cucurbita pepo Oil Soap Antibacterial Activity

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