Regioselectivity nitration of aromatics with N2O5 in PEG-based dicationic ionic liquid

✍ Scribed by Peng-Cheng Wang; Ming Lu

• Publisher: Elsevier Science
• Year: 2011
• Tongue: French
• Weight: 466 KB
• Volume: 52
• Category: Article
• ISSN: 0040-4039
• DOI: 10.1016/j.tetlet.2011.01.053

✦ Synopsis

Regioselective mononitration of simple aromatic compounds has been investigated with N 2 O 5 as nitrating agent and a new PEG200-based dicationic acidic ionic liquid (PEG 200 -DAIL) as catalyst. The results of experiments show that this nitration system can significantly improve the para-selectivity of alkyl-benzenes and the ortho-selectivity of halogenated-benzenes. The PEG 200 -DAIL exhibits recyclable temperature-dependant phase behavior in CCl 4 solvent, and it can be recycled without apparent loss of catalytic activity, and only 5% loss of weight is observed after six times recycling.