“…Lewis acids, commonly used as efficient catalysts, have been applied in various reactions, including methanol aromatization, γ-valerolactone decarboxylation, and indole cycloaddition . Additionally, Lewis acids such as Ni(ClO 4 ) 2 ·6H 2 O, Zn(OTf) 2 , AlCl 3 , and ZnCl 2 have been demonstrated to be effective in catalyzing Friedel–Crafts alkylation reactions involving alkenes with trifluoropyruvates, pyrroles with 2-enoyl-pyridine N -oxides, and ferrocene with allylchlorosilanes .…”