https://doi.org/10.1351/goldbook.T06396
The ![Not defined](/img/inline/T06396.png)
identity reaction
leading to exchange of the positions of identical ligands
. The indistinguishable molecular entities involved are called topomers. For example in the reaction below the two identical ligating atoms Na and Nb are interchanged by rotation about the C-aryl bond but may be identified by NMR spectroscopy
. This is a degenerate isomerization
. ![Not defined](/img/inline/T06396.png)