1 H n.m.r. studies of π-C5H5M(CO)2[(p-MeC6H4)2CNC(p-MeC6H4)2](M = Mo, W) in the temperature range –20 to 70° showed the bonding of the aza-allyl group to the metals to be of the σ–π type: epimerisation occurs at the higher temperatures through processes of rotation and interchange of σ–π bonding.
H. R. Keable and M. Kilner, J. Chem. Soc. D, 1971, 349 DOI: 10.1039/C29710000349
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