Johari, Suzaimi and Zaharani, Lia and Gorjian, Hayedeh and Johan, Mohd Rafie and Khaligh, Nader Ghaffari (2022) A novel sublimable organic salt: Synthesis, characterization, thermal behavior, and catalytic activity for the synthesis of arylidene, heteroarylidene, and alkylidene malonates. Research on Chemical Intermediates, 48 (1). pp. 361-377. ISSN 0922-6168, DOI https://doi.org/10.1007/s11164-021-04587-4.
Full text not available from this repository.Abstract
A novel sublimable organic salt was synthesized, and its chemical structure was characterized by FTIR, 1D NMR, 2D NMR, and elemental analysis. In addition, the thermal phase transitions and thermal stability of new organic salt were investigated. The DSC and TGA results showed that the organic salt could convert into constituent molecules at < 145 degrees C before decomposition temperature (T-dec. similar to 200 degrees C) under atmospheric pressure without forming the liquid phase. Then, it was recondensed to regenerate the initial organic salt in the cool part of the vial. Therefore, it can be a promising organic salt towards the regeneration of spent catalyst from synthesis processes when the reaction mixture contains poorly volatile components and includes its use in gas-phase procedures. Also, the catalytic efficiency of new organic salt was investigated in the Knoevenagel condensation reaction. A variety of substituted arylidene and alkylidene malonates were isolated in 78-95% yield within six hours.(sic) Under the optimized reaction conditions, the current catalytic procedure exhibited superiority compared to the mixed piperazine/acetic acid, piperidine/acetic acid, and piperidinium acetate. There were no significant changes in the new organic salt chemical structure and catalytic activity even after the 5th run. This work revealed the importance of the existence of simultaneous hydrogen bond acceptor/donor groups in our environmentally friendly catalyst to promote the Knoevenagel condensation reaction without the use of metal-containing catalysts.
| Item Type: | Article |
|---|---|
| Funders: | [IF065-2020] |
| Uncontrolled Keywords: | Organic salt; Hydrogen bonds; Carbonyl compounds; Carbon-carbon coupling; Knoevenagel products |
| Subjects: | Q Science > QD Chemistry |
| Divisions: | Nanotechnology & Catalysis Research Centre |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 28 Apr 2022 07:34 |
| Last Modified: | 28 Apr 2022 07:34 |
| URI: | http://eprints.um.edu.my/id/eprint/33772 |
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