| Autor: |
Qaroush, Abdussalam K., Hasan, Areej K., Hammad, Suhad B., Al-Qaisi, Feda'a M., Assaf, Khaleel I., Alsoubani, Fatima, Eftaiha, Ala'a F. |
| Předmět: |
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| Zdroj: |
New Journal of Chemistry; 12/21/2021, Vol. 45 Issue 47, p22280-22288, 9p |
| Abstrakt: |
We reported on sustainable, one-pot synthesized caffeine-based compounds as effective, bifunctional, heterogenous, hydrogen-bond-donor organocatalysts for the cycloaddition of CO2 with several epoxides, supported by a mechanistic study and verified by density functional theory calculations. Two reaction intermediates were isolated during the catalytic cycle: the first involving hydrogen bonding between caffeinium bromide and epichlorohydrin upon exchanging Br− with PF6−, and the second comprising of the nucleophilic attack of Br− followed by ring opening, as deduced from the appearance of a peak corresponding to the C–Br bond in the ATR-FTIR spectrum in the absence of CO2. In this respect, most of the literature is based on postulated mechanisms, racing to achieve lower working conditions, urging us to dig deeper to understand the aforementioned reaction. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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