Chemistry Letters, Vol.34, No.5, 716-717, 2005
Active and reusable catalyst in the friedel-crafts alkylation derived from a heteropoly acid
The H3PO4-WO3-Nb2O5 derived catalyst exhibited excellent activity and reusability in the benzylation of anisole at low temperature. On the basis of the XRD and IR data, the oxide derived from heteropoly acid was ascribed to the active and insoluble species in the reaction. It was found that the calcination temperature was the key factor in the generation of active species.