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Cross-linked polystyrene-supported aluminum triflate (Ps-Al(OTf) 3 ) has been shown to be a mild, efficient, and chemoselective heterogeneous Lewis acid catalyst for the acylation of aromatic compounds. The catalyst can be easily prepared from cheap starting materials, is stable (as a bench top ca- talyst) and is reusable.

Friedel-Crafts acylation of arenes with carboxylic acids using polystyrene-supported aluminum triflate