Short-RInChIKey=SA-FUHFF-UHFFFADPSC-OGJNIRVMBU-UHFFFADPSC-NUHFF-MYXSC-NUHFF-ZZZ

In a vial, (E)-1,2,3,3-tetramethyl-5-(1H,2H-perfluoroct-1-en-1-yl)-3H-indolium iodide (131 mg, 203 µmol, 1.00 equiv.) and Vilsmeier-Haack salt (32.9 mg, 91.5 µmol, 0.45 equiv.), dissolved in 5.38 mL of dry EtOH and stirred for 2 h at 100 °C under argon atmosphere. After cooling down, 20 mL ethyl acetate was added. The organic phase was washed with 15 mL of water, washed with sat. aqueous NaCl solution and then dried over Na2SO4.