endo-endo-3,6-Diaminobicyclo[3.1.0]hexane species 6 prefer a chair conformation. This has been established by X-ray structure analysis of derivative 6c and by 1H and 13C NMR spectroscopic analysis of compounds 6a and 6b. Intramolecular hydrogen bonding in 13, the monoammonium salt of 6b, can change the conformational situation.
E. Vilsmaier, J. Fath, C. Tetzlaff and G. Maas, J. Chem. Soc., Perkin Trans. 2, 1993, 1895 DOI: 10.1039/P29930001895
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