Abstract

Polystyrene-supported pyridinium chloroaluminate ionic liquid was prepared from the reaction of a Merrifield resin with pyridine followed by reaction with aluminium chloride. This catalyst was used as a new chemo- selective Lewis acid catalyst for the exclusive synthesis of 2-substituted benz- imidazoles from the reaction of aldehydes with o-phenylenediamines. The cata- lyst was stable (as a benchtop catalyst) and could easily be recovered and re- used without appreciable change in its efficiency.

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