Ruthenium-Catalyzed One-Step Transformation of Propargylic Alcohols into Alkylidene Cyclobutenes: X-ray Characterization of an Ru(η3-cyclobutenyl) Intermediate
作者:Jacques Le Paih、Sylvie Dérien、Christian Bruneau、Bernard Demerseman、Loïc Toupet、Pierre H. Dixneuf
The precatalyst [Cp*RuCl(cod)] promotes the head-to-head cyclodimerization of propargylic alcohols and the formation of novel alkylidene cyclobutenes (see scheme; Cp*=C5 Me5 , cod=1,5-cyclooctadiene) by addition of carboxylic acid to the Ru(η4 -cyclobutadiene) intermediate and dehydration.