Abstract
AbstractTricarbonyl(4‐alkoxyl‐1‐alkylcyclohexadienylium)iron complexes (I) react with metal‐cation enolate nucleophiles to give in most cases a mixture of products (II) and (III), resulting from attack at the C‐1 and C‐5 termini of the dienylium ring. Factors that control the regioselectivity of nucleophilic addition, including the steric and electronic effects of the 4‐alkoxyl and 1‐alkyl substituents, the degree of association between the enolate nucleophiles and their counterions, and the polarity of the solvents, were investigated.
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