Anionic cyclohexadienyl–Cr(CO)3 complexes, formed by addition of reactive carbanions to benzene–Cr(CO)3 and naphthalene–Cr(CO)3 complexes, react with Mel by addition and carbonylation to yield disubstituted cyclohexadienes and dihydronaphthalenes, respectively.
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Kündig et al. (1983) studied this question.