[reaction: see text] A ruthenium(II) complex possessing a planar Cp ligand, CpRu(cod)Cl, effectively catalyzed the [2 + 2 + 2] cycloaddition of 1,6-diynes with isocyanates to afford bicyclic pyridones in 58-87% yields.
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Yamamoto et al. (2001) studied this question.
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