Abstract
AbstractThe allenic α‐ketones 5a–f give, on irradiation in the presence of [Fe(CO)5], the bis(tricarbonyliron) complexes 6a–f. In the case of ketone 5e, a minor bis(tricarbonyliron) complex with the proposed unique structure 8 is also obtained. Ketones 5a–d, which are disubstituted at C(4), under the same conditions, afford also the lactones 7a–d in moderate yields. The latter reaction is a new carbonyliron‐mediated carbonyl insertion. The structure of the binuclear complexes 1a and 6e were established by X‐ray crystallography.
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