The rate of linkage isomerization of (η5-C5Me5)Re(CO)2(15N![[triple bond, length as m-dash]](https://www.rsc.org/images/entities/char_e002.gif)
14N) to give (η5-C5Me5)Re(CO)2(14N15N) has been measured from 15N NMR intensities, yielding a ΔG‡ value of 90 kJ mol–1 for the end-to-end rotation process; this is confirmed to be intramolecular and non-dissociative by a cross-over experiment using (η5-C5H5)Re(CO)2(14N14N) and (η5-C5Me5)Re(CO)2(15N14N).
A. Cusanelli and D. Sutton, J. Chem. Soc., Chem. Commun., 1989, 1719 DOI: 10.1039/C39890001719
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