Rotation of the cyclopentadienyl ring about the metal-ring bond in complexes such as (1) depends upon the substituents R and R′. The first rigid rotamers of this kind have been detected in (1a), RR′tBu; (1b), RR′iPr, exhibits free rotation probably as a result of a “gear mechanism”.
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Hofmann et al. (1977) studied this question.
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