The X-ray crystal structure of the aziridine (7a) shows that the preferred orientation around the N–N bond has the lone pairs of electrons on adjacent nitrogens eclipsed; the rotamer equilibria around the N–N bonds in the two stereoisomers (7a) and (7b) suggest that this is also the preferred conformation for these substituted hydrazines in solution.
R. S. Atkinson, J. Fawcett, D. R. Russell and G. Tughan, J. Chem. Soc., Chem. Commun., 1987, 458 DOI: 10.1039/C39870000458
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