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Scope of the synthesis of cyclopentadienes.[a]
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[a] Reaction conditions: 2 (0.1 m in EtOAc), allene 5 (1.5 equiv), catalyst B (5 mol %), 100 °C, 12 h. Yields are for the isolated product. [b] The reaction was carried out with 2.0 equivalents of the allene. [c] The reaction was carried out with 3.0 equivalents of the allene.
