Synthesis, Characterization and Antimicrobial Assessment of 3, 4, 5-Trimethoxy-3’, 4’-Dimethoxychalcone and 2, 4, 6-Trimethoxy-3’, 4’-Dimethoxychalcone

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Emmanuel E odion
Davy O. Enadeghe


 Background: Chalcones have been utilised in the synthesis of different heterocyclic molecules with antimicrobial activity.

Aims: This study aims to synthesise, characterise and screen 3, 4, 5-trimethoxy-3’, 4’-dimethoxychalcone and 2, 4, 6-trimethoxy-3’, 4’-dimethoxychalcone for antimicrobial property.

Methods: 3, 4, 5-trimethoxy-3’, 4’-dimethoxychalcone was synthesized from Claisen-Schmidt condensation reaction between 3, 4-dimethoxyacetophenone and 3, 4, 5-trimethoxybenzaldehyde in the presence of 50 % potassium hydroxide at room temperature and subsequently neutralised with 50 % acetic acid. Similarly, 2, 4, 6-trimethoxy-3’, 4’-dimethoxychalcone was produced through the reaction between 3, 4-dimethoxyacetophenone and 2, 4, 6-trimethoxybenzaldehyde in the presence of 50 % potassium hydroxide for 2 hrs at 70 oC and consequently neutralised by 50 % acetic acid. Purity was evaluated by melting point determination and thin layer chromatography (TLC). Characterization was done using UV and IR spectroscopy, 1HNMR, 13CNMR, Mass spectroscopy and Elemental Analysis.

Result: The compounds were screened for antimicrobial activity. 3, 4, 5-trimethoxy-3’, 4’-dimethoxychalcone was obtained as yellow crystal (melting point 121-122 oC, percentage yield 46 %) through the condensation reaction between 3,4-dimethoxyacetophenone and 3, 4, 5-trimethoxybenzaldehyde. While 2, 4, 6-trimethoxy-3’, 4’-dimethoxychalcone a yellow crystal (melting point 150-151 oC, percentage yield 41%) was synthesised by reacting 3, 4-dimethoxyacetophenone and 2, 4, 6-trimethoxybenzaldehyde.

Conclusion: Both synthesised chalcones do not have appreciable antimicrobial activity.


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odion, E. E., Usifoh, C., & O. Enadeghe, D. . (2021). Synthesis, Characterization and Antimicrobial Assessment of 3, 4, 5-Trimethoxy-3’, 4’-Dimethoxychalcone and 2, 4, 6-Trimethoxy-3’, 4’-Dimethoxychalcone. Nigerian Journal of Pharmaceutical and Applied Science Research, 10(2), 1–5. Retrieved from
Author Biography


Department of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Benin.

Professor of Pharmaceutical Chemistry


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