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Приказ резултата 1-3 од 3
Control of intramolecular γ-alkylation vs. α-alkylation of an αβ-unsaturated ketone: An unusual solvent effect
(Royal Society of Chemistry, 1979)
Most base-solvent combinations convert (2) into (3); γ-alkylation to yield (5) is effected by sodium hydroxide in dimethyl sulphoxide-water mixtures in which the water content is critical.
Photochemically induced oxidation of some steroidal isoxazolidines by molecular oxygen
(Royal Society of Chemistry, 1977)
U.v. irradiation of the steroidal isoxazolidines 5α,10α-imino- oxy-5(10 → 1βH)abeo-5α-cholestan-3β-olacetate (1a) and the corresponding N-methyl and N-acetyl derivatives (1b) and (1c) in various solvents in the presence ...
New approach to the aromatization of ring B in 19-norsteroids and to the synthesis of equilenin-type compounds
(Royal Society of Chemistry, 1978)
When 7α-acetoxy-3,3 : 17,17-bis(ethylenedioxy)-5,10-epoxy-5β, 10β-oestran-6-one (2), formed by lead tetra-acetate acetoxylation of the parent compound (1), is heated with alkali, it undergoes ring B aromatization to give ...