Stepwise ligand exchange from 1 leads to the unique dinuclear complex 3, in which a trialkylphosphane is linked in a bridging position to two transition metal centers. In the isolated intermediate [ClRh(μ-PMe3)(μ-CPh2)2Rh(acac)] (2) the phosphane behaves as a semibridging unit, as confirmed by an X-ray crystal structure analysis. acac=acetylacetonate.
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Pechmann et al. (2000) studied this question.
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