The cyclodimerization of α,ω-allenynes using Cp*RuCl(cod) catalyst is described. This reaction proceeds via an alkylidene ruthenacyclopentene intermediate, which is generated by the oxidative cycloaddition of alkyne and the internal double bond of the allene, to give a unique pentacyclic compound having two five-membered rings and three four-membered rings in high yields.
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Saito et al. (2009) studied this question.
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