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Diels–Alder cycloaddition between azoniaanthracene and bis-substituted olefin leading to 6,11-ethanobenzo-[b]quinolizinium. Reagents and conditions: a) H2O/HOAc (10 %), trifluoroethanol (TFE); conventional conditions: 100 °C, 120 min, 76 %; microwave irradiation: 100 °C (500 W), 3 min, 78 %. Result: acceleration.
