1: FSO3H*SbF5 / hexafluoroisopropyl alcohol / 2 h / 0 - 20 °C / Inert atmosphere; Large scale reaction 2: 10 palladium on activated charcoal / 1,3,5-trimethyl-benzene / Reflux; Inert atmosphere View Scheme

With  FSO3H*SbF5 in  hexafluoroisopropyl alcohol T=0 - 20°C; Friedel Crafts type cyclization;