Slipping rings: A reversible shift from η5-Cp to η1-Cp and back has been established for ring-strained metallocenophanes (see scheme) and the dependence of the reversibility on the degree of ring strain has been probed. The presence of phosphane ligands has allowed the isolation of novel η1-Cp ring-slipped Fe and Ru complexes.
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Tanabe et al. (2005) studied this question.
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