title: 19-Nor and aromatic steroids. II. Cleavage of 3-oxygenated 4beta,19-ethers in the pregnane series leading to 19-norprogesterone.
mesh_terms: D004988:Ethers, Cyclic / Q000138:chemical synthesis; D009682:Magnetic Resonance Spectroscopy; D008722:Methods; D009650:Norpregnanes / Q000138:chemical synthesis*; D010084:Oxidation-Reduction; D011374:Progesterone / Q000138:chemical synthesis*
chemical_list: D004988:Ethers, Cyclic; D009650:Norpregnanes; D011374:Progesterone