Coordinatively unsaturated ruthenium allenylidene complexes: highly effective, well defined catalysts for the ring-closure metathesis of α,ω-dienes and dienynes

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Alois Fürstner, Monika Liebl, Anthony F. Hill and James D. E. T. Wilton-Ely


The well defined, conveniently accessible and coordinatively unsaturated allenylidene complexes [RuCl2([double bond, length half m-dash]C[double bond, length half m-dash]C[double bond, length half m-dash] CPh2)(PCy3)2] and [Ru2Cl4([double bond, length half m-dash]C[double bond, length half m-dash]C[double bond, length half m-dash]CPh2)(PCy3)(η-MeC6-H4Pri-4)] are highly effective catalysts for the ambient temperature ring-closure metathesis of α,ω-dienes and dienynes, illustrated by the facile and high yielding formation of variously functionalised 5, 6, 7, 8, 15, 16 and 18 membered mono- and bi-cyclic ring systems.


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