Blocking of the Retro‐Diels–Alder Reaction by Complex Formation: [(η5‐Cyclopentadienyl)(η5‐dicyclopentadienyl)iron]
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In the case of lithium compound 1 the retro‐Diels‐Alder reaction does not have to be accelerated artificially—quite the opposite! 1 represents a rare case in that it reacts before it can be investigated. It has now been possible to trap 1 as the title compound 2 with solvated iron(II) chloride. 2 is also of interest with regard to its possible chemical reactions. It is reminiscent of ferrocene, but has a highly distorted π‐system. (Figure Presented.) Copyright © 1988 by VCH Verlagsgesellschaft mbH, Germany
author list (cited authors)
Blümel, J., Köhler, F. H., Müller, G., & Wilkinson, D. L.