Mixed-metal chemical synergy is strikingly exemplified by the clean, selective deprotonation of one benzene ring of bis(benzene)chromium by bimetallic (Na/Mg or K/Mg) amide base mixtures. The bis(benzene)chromium moiety forms high-yielding crystalline trimetallic products (see picture) with the mixed bases, but it is inert towards the non-synergic, parent monometallic amides. Na/K red; Mg green; Cr light blue; N yellow; C black.
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Hevia et al. (2004) studied this question.
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