Bridged 1,5-benzodiazepines, products of condensation of o-phenylenediamines with 4,6-dimethyl-bicyclo[3.3.1]nona-3,6-diene-2,8-dione, give barbaralanes on electrochemical reduction; the mechanism of the reduction has been elucidated and the valence isomerisation of the barbaralanes has been shown by variable temperature 1H n.m.r. analysis.
J. M. Mellor, B. S. Pons and J. H. A. Stibbard, J. Chem. Soc., Chem. Commun., 1979, 761 DOI: 10.1039/C39790000761
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