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The 1,3,5-cyclooctatriene ligand of Ru(1-6-η-cyclooctatriene)(1-2:5-6-η-cyclooctadiene) reacted with ethyne to yield Ru(η4, η2-bicyclo[4.2.2]deca-2,4,7-triene)(1-2:5-6-η-cyclooctadiene) by way of formal [η6s + η2s] cycloaddition with high selectivity. Propyne or 1-butyne gave analogous bicylodecatriene complexes.
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Itoh et al. (1983) studied this question.
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