A solid superacid, which was prepared by exposing Zr(OH)4 to 0.5 mol dm–3 H2SO4 followed by calcining in air at 650 °C, was catalytically active in the acylation of toluene with acetic and benzoic acids in a heterogeneous system; this catalyst was also active for the reaction using ethyl and methyl esters as the acylating reagent.
M. Hino and K. Arata, J. Chem. Soc., Chem. Commun., 1985, 112 DOI: 10.1039/C39850000112
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