A nickel-catalyzed intramolecular cyclization of alkynylalkanone in the presence of Et(3)SiH using an NHC ligand produced various carbo- and heterocycles in a stereoselective manner. The reaction would proceed via formation of oxanickelacycle followed by sigma-bond metathesis with silane to give a bi- or tricyclic compound.
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Saito et al. (2010) studied this question.
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