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The tricarbonyl(vinylketene)iron(o) complex 1 reacts with electron-poor alkenes to give decarbonylated adducts 3 and these are oxidised to tetrasubstituted cyclopropanes 4 using CAN; an X-ray crystal structure analysis of the adduct formed from 1 and dimethyl fumarate define its relative stereochemistry. But But3ad / 1 2a-d 4b-d a R1 = C02Me, R2 = H, R3 = C02Me; b R1 = H, R2 = C02Me, l? = C02Me; c R' = H, F? = COMe, R3 = C02Me; d R' = H, R2 = CF3, R3 = C02Et

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