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https://irlib.pccu.edu.tw/handle/987654321/48839
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| Title: | Synthesis of coumarin derivatives in a microfluidic flow system employing the Pechmann condensation: A case study |
| Authors: | Liu, LK (Liu, Ling-Kang)
Deng, JH (Deng, Jhao-Hong)
Guo, YM (Guo, Yang-Ming) |
| Contributors: | 化學系 |
| Keywords: | catalyst recovery and reuse
Coumarin derivatives
ionic liquid
microfluidic flow reactions
Pechmann condensation |
| Date: | 2020-11 |
| Issue Date: | 2020-11-27 14:35:37 (UTC+8) |
| Abstract: | For the synthesis of coumarin derivatives using the Pechmann condensation scheme, an acidic ionic liquid catalyst, abbreviated as [EBsImH][HSO4], was prepared from the ring opening of 1,4-butanesultone by 1-ethylimidazole, followed by the addition of 1 equiv. H2SO4(c). The [EBsImH][HSO4]-catalyzed Pechmann condensation reactions proceeded smoothly in a batch setup, with recyclable [EBsImH][HSO4] showing great catalytic activity. The acidic ionic liquid catalyst [EBsImH][HSO4] was recovered from EtOAc/H2O extraction of the product mixture, where the H2O layer was worked up and dried for reuse in consecutive runs of the Pechmann condensation reactions, maintaining >85% conversion for four times. The catalytic reactions were also carried out in a microfluidic flow setup. The flow parameters, the reactant molar amounts, and the additional H2SO4 as a modifying acid catalyst were optimized in the current case study. A minimum conversion rate of 2.8 g/hr of coumarin derivatives was demonstrated. |
| Relation: | JOURNAL OF THE CHINESE CHEMICAL SOCIETY 早期取閱: NOV 2020 |
| Appears in Collections: | [Department of Chemistry & Graduate Institute of Applied Chemistry ] journal articles
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