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Microwave irradiation of alkynyl allenes leads to an intramolecular [2π+2π] cycloaddition reaction to provide bicyclomethylenecyclobutenes. Reagents and conditions: a) [EMIM][PF6] (3 m), toluene; conventional conditions: no reaction; microwave irradiation: 250 °C, 15 min, 74 %. Result: reaction takes place only under microwave irradiation.
