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A step on the way to palladocene could be the reaction shown below. The isolable compounds (1), LPMe3, P(iPr)3, PPh3, show a single sharp singlet for all ten cyclopentadienyl protons in the NMR spectrum. A fluxional structure, at least in solution, is deduced from the temperature dependence of the spectrum.
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Werner et al. (1979) studied this question.
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