The structure of 5α-cholestano[2,3-c]furazan 2′-oxide, obtained from 2,3-bishydroxyimino-5α-cholestane, is established by its preparation from 2-nitro-5α-cholest-2-en-3-ol. Base-catalysed nitration of 5α-cholestan-7-one gives 6α- and 6β-nitro-derivatives, which adopt keto- rather than enol forms.
D. J. Chadwick, W. R. T. Cottrell and G. D. Meakins, J. Chem. Soc., Perkin Trans. 1, 1972, 655 DOI: 10.1039/P19720000655
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