The photolysis of trans-1-isopropenyl-4-methylenespiro[2.x]alkanes (1)(x= 4,5, or 6) in presence of Fe(CO)5 at room temperature leads to formation (60%) of isomeric mononuclear irontricarbonyl π-complexes of linear trienes [(2) and (3)] and (10%) of a di-ironhexacarbonyl–bis-π-allyl complex of a branched triene (4).
S. Sarel, M. Langbeheim and I. Ringel, J. Chem. Soc., Chem. Commun., 1979, 73 DOI: 10.1039/C39790000073
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