Palladium catalysed [2 + 2 + 1] intramolecular cycloaddition for the preparation of bicyclo[3.3.0]octa-1.5-dien-3-ones from 1,6-diynesElectronic supplementary information (ESI) available: experimental. See http://www.rsc.org/suppdata/cc/b3/b302841k/

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