The configurational stability of compounds 1–4 has been confirmed by NMR spectroscopy and chiral chromatography (analytical separation of enantiomers 1 and 2); the antiaromatic (4n) destabilisation of the planar transition state of enantiomerisation is discussed.
Configurationally stable axially chiral N,N'-dialkyl-2,2'-biphenylene-N,N'-ureas
A. I. Roshchin and R. G. Kostyanovsky, Mendeleev Commun., 2003, 13, 275 DOI: 10.1070/MC2003v013n06ABEH001749
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