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Rhodium Acetate Dimer Immobilized in 1‐Butyl‐3‐methylimidazolium Hexafluorophosphate Ionic Liquid: a Novel and Recyclable Catalytic System for the Cyclopropanation of Alkenes
Author(s) -
Yadav J. S.,
Reddy B. V. S.,
Reddy P. Narayana
Publication year - 2004
Publication title -
advanced synthesis and catalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.541
H-Index - 155
eISSN - 1615-4169
pISSN - 1615-4150
DOI - 10.1002/adsc.200303136
Subject(s) - hexafluorophosphate , cyclopropanation , ionic liquid , chemistry , rhodium , catalysis , dimer , organic chemistry , medicinal chemistry
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.