Rhodium Acetate Dimer Immobilized in 1-Butyl-3-methylimidazolium Hexafluorophosphate Ionic Liquid: a Novel and Recyclable Catalytic System for the Cyclopropanation of Alkenes

✍ Scribed by J. S. Yadav; B. V. S. Reddy; P. Narayana Reddy

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 92 KB
• Volume: 346
• Category: Article
• ISSN: 1615-4150
• DOI: 10.1002/adsc.200303136

✦ Synopsis

Alkenes undergo smooth cyclopropanation with ethyl diazoacetate using a catalytic amount of rhodium acetate dimer, Rh 2 (OAc) 4 , immobilized in the air-and moisture-stable 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid, [bmim]PF 6 , to afford cyclopropanecarboxylates in excellent yields with high trans-selectivity. The recovery of the catalyst is facilitated by the hydrophobic nature of [bmim]PF 6 . The recovered ionic liquid containing Rh 2 (OAc) 4 can be reused for three to five subsequent runs with only a gradual decrease in activity.