Add time:08/11/2019 Source:sciencedirect.com
The Freidel-Crafts sulfination reaction of Acetanilide (cas 103-84-4) with sulfur dioxide was catalyzed by several AlCl3-based liquid coordination complexes (LCCs), and the results were compared with that catalyzed by traditional ILs. Influences of different catalysts, ligand/AlCl3 molar ratios, and reaction conditions on their catalytic performance were investigated. The optimal result was obtained using acetamide-AlCl3-based LCC (molar ratio of acetamide to AlCl3 was 0.65, marked as 0.65 A A/AlCl3) as the catalyst, giving nearly 100% conversion of acetanilide within 60 min and 94.07% of selectivity to 4-acetamidobenzenesulfinic acid. AA/AlBr3 was synthesized and also showed catalytic activity for the sulfination reaction. Then a plausible reaction mechanism was proposed by investigation through the raman spectra.
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