Die Ablosung der C,-Kette in (3) vom Metal1 gelingt unter anderem mit CO. Unter CO-Insertion erhalt man neben anderen Produkten das Cycloheptenon-Derivat (6)i6'. Das dabei gebildete Fe(CO), konnte wieder fur die Synthese von (3) verwendet werden, so daB (6) letztlich aus (l), (2) und Nr. L L' Ial VV44-X249/Xl/V4o4-V418 S V2.50/0 Angew C'hem. YJ (1981) Nr. 4 151 a)
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