Ruthenium-Catalyzed One-Step Transformation of Propargylic Alcohols into Alkylidene Cyclobutenes: X-ray Characterization of an Ru(η3-cyclobutenyl) Intermediate

Abstract
The precatalyst [Cp*RuCl(cod)] promotes the head-to-head cyclodimerization of propargylic alcohols and the formation of novel alkylidene cyclobutenes (see scheme; Cp*=C5Me5, cod=1,5-cyclooctadiene) by addition of carboxylic acid to the Ru(η4-cyclobutadiene) intermediate and dehydration.

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