SCHEDULED MAINTENANCE
Oxidation of 9(11)-dehydrohecogenin acetate with nitrous acid leads to 9(11)-dehydro-23-oxohecogenin acetate in good yield. Substitution at position 20 as well as at position 23 is effected by condensation with paraformaldehyde in acetic acid. The nature of the condensation products has been investigated.
D. H. R. Barton, P. G. Sammes, M. V. Taylor and E. Werstiuk, J. Chem. Soc. C, 1970, 1977 DOI: 10.1039/J39700001977
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