The major product from the photoreaction of 4-methylenedispiro[2,1,2,3]decane (5) with Fe(CO)5 is shown to be a tricarbonyliron σ,π-complex of structure (7), whereas the products from 4-methylenespiro[2,4]heptane (9) and 4-methylenespiro[2,5]octane (15) are the respective bi-cyclic enones (12)–(13) and (16).
S. Sarel, A. Felzenstein, R. Victor and J. Yovell, J. Chem. Soc., Chem. Commun., 1974, 1025 DOI: 10.1039/C39740001025
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