Tricarbonylallyliron cations as intermediates in the Friedel–Crafts acylation of tricarbonylbutadieneiron

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Abstract
The intermediates (RCO·CH2CH[graphic omitted]CH[graphic omitted]CH2)-Fe(CO)3 + AlCl4 –(or PF6 –) probably have the acyl oxygen co-ordinated to iron and lose protons stereoselectively to give syn- or anti-tricarbonyl-acylbutadiene-iron depending on the base used.