19-Nor steroids (7) and (8) have been synthesised via oxidation of 2,4-dibromoestrogens (1) and (2) with nitric acid followed by hydrogenation over palladium-on-charcoal and subsequent treatment with Nafion-H.
M. Numazawa, K. Hoshi and K. Kimura, J. Chem. Soc., Chem. Commun., 1987, 490 DOI: 10.1039/C39870000490
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