1 Laboratoire de physico-chimie des hydrocarbures, UMR 7513, Universite L. Pasteur, 4 rue B. Pascal, 67000 Strasbourg, France. kkoltunov@chimie.u-strasbg.fr
Zeolites and other available solid acids have been successfully applied to initiate reactions, which were earlier recognised to involve superelectrophilic intermediates and thus required excess of superacids to be carried out.