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Title
Highly Active Catalysts in Alkene Metathesis: First Observed Transformation of Allenylidene into Indenylidene via AlkenylcarbyneRuthenium Species ( This work was supported by the CNRS, the Ministère de la recherche, the European Union within the EU network Polycat (UPRN-CT-2000-10) and a Marie Curie Fellowship to RC, and the Région Bretagne with the program PRIR (No.169 AOC). )