Application of Ionic Liquid Halide Nucleophilicity for the Cleavage of Ethers: A Green Protocol for the Regeneration of Phenols from Ethers
Shanthaveerappa K. Boovanahalli, Dong Wook Kim and Dae Yoon Chi*
*Department of Chemistry, Sogang University, 1 Shinsudong, Mapoku, Seoul 121-742, Korea, Email: dychisogang.ac.kr
S. K. Boovanahalli, D. W. Kim, D. Y. Chi, J. Org. Chem., 2004, 69, 3340-3344.
The ionic liquid [bmim][Br] confers high nucleophilicity on the bromide ion for the nucleophilic displacement of an alkyl group to regenerate a phenol from the corresponding aryl alkyl ether in good yield in the presence of p-toluenesulfonic acid. Dealkylation of various aryl alkyl ethers could also be achieved using stoichiometric amounts of concentrated hydrobromic acid in [bmim][BF4].
see article for more examples