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.
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Saberi et al. (1994) studied this question.
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