The configuration on the C![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
N bond of the title compounds has been determined by X-ray analysis and is in agreement with the previous assignment based on dipole moments.
I. K. Larsen and O. Exner, J. Chem. Soc. D, 1970, 254 DOI: 10.1039/C29700000254
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