The combination of an indium complex with lithium perchlorate affords a potent system for the catalytic acylation of electron-rich aromatics and alcohols. The use of isopropenyl acetate as acyl donor results in cleaner methodology with acetone as the only by-product. The study has also revealed an indium-catalysed ketalisation reaction.
Chapman, C. J., Frost, C. G., Hartley, J. P., & Whittle, A. J. (2001). Efficient aromatic and heteroatom acylations using catalytic indium complexes with lithium perchlorate. Tetrahedron Letters, 42(5), 773-775. https://doi.org/10.1016/S0040-4039(00)02122-5