Abstract
Molecular orbital calculations for [C7H7Fe(CO)3]-predict a η3 -allyl anion Fe(CO)3 complex with un-coordinated diene part of the C7H7 ligand to be more stable than the alter-native η4 -butadiene Fe(CO)3 form, the cyclopolyenyl ligand being nonplanar in either case. The tiny energy difference between both coordination modes accounts for the observed high fluxionality of the anion.

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