Results 221 to 230 of about 7,631 (266)
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NMR spectra of androstane analogs of brassinosteroids
Journal of Applied Spectroscopy, 2007We have used two-dimensional NMR spectroscopy to make a complete assignment of signals from the nuclei of hydrogen and carbon atoms in the spectra of brassinosteroids in the androstane series. We have confirmed the stereochemistry of the chiral centers and the structure of the molecules.
Vladimir A. Khripach +4 more
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, 1979
Hydroxy-ketones in the 5α-androstane series are converted into fluoro-ketones by diethylaminosulphur trifluoride under mild conditions; acetoxy-ketones give acetoxydifluorides under more vigorous conditions.
T. G. Bird +3 more
semanticscholar +1 more source
Hydroxy-ketones in the 5α-androstane series are converted into fluoro-ketones by diethylaminosulphur trifluoride under mild conditions; acetoxy-ketones give acetoxydifluorides under more vigorous conditions.
T. G. Bird +3 more
semanticscholar +1 more source
The abortifacient effect of synthetic androstane derivatives in the baboon
Contraception, 1983Synthetic androstane derivatives have been tested for their ability to induce abortion during early pregnancy in primates. Two compounds were studied following intramuscular (IM) and oral treatment in fourteen baboons. A five-day treatment regimen was started at approximately day 20 of pregnancy in 12 baboons, with treatment delayed until after day 40 ...
V. Z. Pope, Lee R. Beck, C. E. Pope
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Derivatives of the androstane series
Chemistry of Natural Compounds, 19701. The synthesis of 17β-hydroxyandrostano[3,2-c]pyrazole and of cholestano[3,2-c]pyrazole has been effected by the reaction of the corresponding 2-hydroxymethylene-3-oxosteroids with hydrazine hydrate.
I. I. Kuz'menko, L. N. Volovel'skii
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, 1972
The mass spectra of the trimethylsilyl derivatives of several steroids containing a 16-hydroxy function are presented. The mechanisms giving rise to various characteristic fragment ions were investigated with the aid of deuterium and 18O-labeling.
P. Vouros, D. Harvey
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The mass spectra of the trimethylsilyl derivatives of several steroids containing a 16-hydroxy function are presented. The mechanisms giving rise to various characteristic fragment ions were investigated with the aid of deuterium and 18O-labeling.
P. Vouros, D. Harvey
semanticscholar +1 more source
Journal of The Chemical Society-perkin Transactions 1, 1974
Convenient, efficient sequences involving 3α,5-cyclo-intermediates have been developed for obtaining 3,6- and 6,17-dioxygenated 5α-androstanes from the cheap steroid 3β-hydroxyandrost-5-en-17-one.
E. Jones +3 more
semanticscholar +1 more source
Convenient, efficient sequences involving 3α,5-cyclo-intermediates have been developed for obtaining 3,6- and 6,17-dioxygenated 5α-androstanes from the cheap steroid 3β-hydroxyandrost-5-en-17-one.
E. Jones +3 more
semanticscholar +1 more source
SYNTHESIS OF MODIFIED STEROIDS IN THE ANDROSTANE AND ANDROSTENE SERIES [PDF]
Organic Preparations and Procedures International, 2006 AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
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Amino-steroids. Part III. 2- and 3-Amino-5α-androstanes
, 1968Condensation of 2α,3α- and 2β,3β-epoxy-5α-androstanes with secondary cyclic amines gives 2β-amino-3α-ols and 3α-amino-2β-ols respectively; reaction of a 2β-bromo-3α-hydroxy-5α-androstane with the same cyclic amines gives the 2α,3α-epoxide in contrast to ...
C. Hewett, D. S. Savage
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Radioimmunoassays for androsterone, 5α-androstane-3α,17β-diol and 5α-androstane-3β,17β-diol
Steroids, 1977Abstract Androsterone (3α-hydroxy-5α-androstan-17-one), 5α-androstane-3α, 17β-diol and 5α-androstane-3β,17B-diol were conjugated at C-16 through sulfur to bovine and human serum albumin. Rabbits injected with these conjugates produced antibodies suitable for radioimmunoassays of these hormone metabolites.
W.H. Moger +3 more
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, 1973
Although steroidal monoketones with the carbonyl group in ring B or C are relatively unreactive towards Rhizopus nigricans, 2-, 3-, 16-, and 17-ketones give modest yields of dihydroxy-derivatives.
J. W. Browne +6 more
semanticscholar +1 more source
Although steroidal monoketones with the carbonyl group in ring B or C are relatively unreactive towards Rhizopus nigricans, 2-, 3-, 16-, and 17-ketones give modest yields of dihydroxy-derivatives.
J. W. Browne +6 more
semanticscholar +1 more source