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ACCO belongs to the non\u2010heme iron(II) enzyme superfamily and carries out the bicarbonate\u2010dependent two\u2010electron oxidation of its substrate ACC (1\u2010aminocyclopropane\u20101\u2010carboxylic acid) concomitant with the reduction of dioxygen and oxidation of a reducing agent probably ascorbate. The reaction gives ethylene, CO<jats:sub>2<\/jats:sub>, cyanide and two water molecules. A model including the mononuclear iron complex with ACC in the first coordination sphere was used to study the details of O\uf8ffO bond cleavage and cyclopropane ring opening. Calculations imply that this unusual and complex reaction is triggered by a hydrogen atom abstraction step generating a radical on the amino nitrogen of ACC. Subsequently, cyclopropane ring opening followed by O\uf8ffO bond heterolysis leads to a very reactive iron(IV)\u2013oxo intermediate, which decomposes to ethylene and cyanoformate with very low energy barriers. 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