Shahnavaz, Zohreh and Zaharani, Lia and Khaligh, Nader Ghaffari and Mihankhah, Taraneh and Johan, Mohd Rafie (2021) Synthesis, Characterisation, and Determination of Physical Properties of New Two-Protonic Acid Ionic Liquid and its Catalytic Application in the Esterification. Australian Journal of Chemistry, 74 (3). pp. 165-172. ISSN 0004-9425, DOI https://doi.org/10.1071/CH20153.
Full text not available from this repository.Abstract
A new ionic liquid was synthesised, and its chemical structure was elucidated by FT-IR, 1D NMR, 2D NMR, and mass analyses. Some physical properties, thermal behaviour, and thermal stability of this ionic liquid were investigated. The formation of a two-protonic acid salt namely 4,4'-trimethylene-N,N'-dipiperidinium sulfate instead of 4,4'-trimethylene-N,N'-dipiperidinium hydrogensulfate was evidenced by NMR analyses. The catalytic activity of this ionic liquid was demonstrated in the esterification reaction of n-butanol and glacial acetic acid under different conditions. The desired acetate was obtained in 62-88% yield without using a Dean-Stark apparatus under optimal conditions of 10 mol-% of the ionic liquid, an alcohol to glacial acetic acid mole ratio of 1.3 : 1.0, a temperature of 75-100 degrees C, and a reaction time of 4 h. alpha-Tocopherol (alpha-TCP), a highly efficient form of vitamin E, was also treated with glacial acetic acid in the presence of the ionic liquid, and O-acetyl-alpha-tocopherol (Ac-TCP) was obtained in 88.4% yield. The separation of esters was conducted during workup without the utilisation of high-cost column chromatography. The residue and ionic liquid were used in subsequent runs after the extraction of desired products. The ionic liquid exhibited high catalytic activity even after five runs with no significant change in its chemical structure and catalytic efficiency.
| Item Type: | Article |
|---|---|
| Funders: | Universiti Malaya [NANOCAT RU001-2020] |
| Uncontrolled Keywords: | Vitamin E |
| Subjects: | Q Science > QD Chemistry |
| Divisions: | Nanotechnology & Catalysis Research Centre |
| Depositing User: | Ms Zaharah Ramly |
| Date Deposited: | 23 Jul 2022 05:42 |
| Last Modified: | 23 Jul 2022 05:42 |
| URI: | http://eprints.um.edu.my/id/eprint/28109 |
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