Reactions of co-ordinated ligands. Part 18. Ring-expansion reactions of tricarbonyl(η4-tetramethylcyclobutadiene)iron; molecular and crystal structures of [Fe{η4-C6Me4(CF3) 2}(CO)3] and [Fe{C8Me4(CF3)2O 2}(CO)3]

Alan Bond, Martin Bottrill, Michael Green, Alan J. Welch

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