A novel ruthenium-catalyzed reductive coupling reaction of propargylic alcohols has been found to afford the corresponding 1,5-hexadiynes in good yields with high stereoselectivity. This catalytic reaction may proceed via hydroboration of the initially produced ruthenium−allenylidene intermediates with pinacolborane as a key step, disclosing a new reactivity of the allenylidene complexes.
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Onodera et al. (2005) studied this question.
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