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The metal–metal bonds are stable without bridging ligands in the heterodinuclear complexes 1 and 2. The combination of one metal center in a high oxidation state and one in a low oxidation state causes these bonds to be strongly polarized. The reactivity of such systems promises to be interesting–recently the direct insertion of CO2 into the ZrFe and ZrRu bond of related complexes has been achieved. R = p‐tolyl. equation image
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Herberhold et al. (1994) studied this question.
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