Cationic allenylidene ruthenium complexes [Ru CCCR2(L)(Cl)(arene)]PF6 (L = PCy3, PPri3), easily prepared from RuCl2(L)(p-cymene), prop-2-yn-1-ol and NaPF6, are found to be excellent catalyst precursors for ring closing olefin metathesis.
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Fürstner et al. (1998) studied this question.
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