1: 2,6-di-tert-butyl-4-methylpyridinium triflate / acetonitrile / 0.5 h / 150 °C / 5171.62 Torr 2: 9-ethyl-3,6-dimethoxy-9H-carbazole; isopropyl alcohol / water / 0.17 h / 45 °C / 1034.32 Torr / |UV-irradiation 3: sodium hydroxide; water / 0.17 h / 50 °C / 1034.32 Torr View Scheme

1: 2,6-di-tert-butyl-4-methylpyridinium triflate / acetonitrile / 0.5 h / 150 °C / 5171.62 Torr 2: 9-ethyl-3,6-dimethoxy-9H-carbazole; isopropyl alcohol / water / 0.17 h / 45 °C / 1034.32 Torr / |UV-irradiation View Scheme