The dimer of heptafulveneiron tricarbonyl

Amihai Eisenstadt, J. Mitchell Guss, Ronald Mason

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The preparation of the fluxional methyltropyliumiron tricarbonyl from two different precursors is described. Attempts to convert the salt into the parent complex of heptafulveneFe(CO)3 provides a dimer, C22H14Fe2O6, whose structure has been determined by extensive deuterium labelling and NMR spectroscopy, and by X-ray diffraction methods. The dimer is formed by addition across the exocyclic double bond, the electrocyclic dimerisation [which is the formally non-allowed (8 + 8) π-cycloaddition] being promoted by the metal tricarbonyl fragment. The intramolecular bonding in 3,3′-ethano-871,1′-bis(cyclohepta-2,4,6-trienyl)diiron hexacarbonyl is discussed together with its mechanism of formation.

Original languageEnglish
Pages (from-to)245-256
Number of pages12
JournalJournal of Organometallic Chemistry
Issue number2
StatePublished - 29 Oct 1974
Externally publishedYes

Bibliographical note

Funding Information:
One of us (4-E.) is grateful to B-2. Fuchs for discussions, to Professor A. Mandelbaum (Haifa) for the masss pectra and to Mrs. R. Weininger for help - with NMR experiments. R.M. acknowledges support by the Science Research Council and the provision of a pure sample by Professor J. Lewis.


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