n i v e r s i t y of C a l i f o r n i a , San Francisco, CA 94143-0446 SIPQldpY S t e r o i d hormones and d e r i v a t i v e s are l a b e l e d t o high s p e c i f i c a c t i v i t i e s with a c t i v a t e d tritium generated by microwave d i s c h a r g e of tritium gas. The s t e r o i d n
Tritium NMR spectroscopy of steroids
β Scribed by Carel W. Funke; Frans M. Kasperen; Jan Wallaart; Gerard N. Wagenaars
- Publisher
- John Wiley and Sons
- Year
- 1983
- Tongue
- French
- Weight
- 320 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0022-2135
No coin nor oath required. For personal study only.
β¦ Synopsis
The H NMR spectra of a series of 7 steroids tritiated at C ( l ) , C ( 2 ) , C ( 6 ) , C ( 7 ) , C ( 9 ) and C ( 1 6 ) yield quantitative information on the 3H distribution i n these compounds. Deuterated chloroform i s not a good solvent to examine the regio-and stereospecificity of the labelling process for acid labile positions such as C(2) in a 3-oxosteroid and C ( 6) in a 8-0x0-0 -steroid.
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Pharmacy, U n i v e r s i t y o f C a l i f o r n i a , San Francisco, C a l i f o r n i a 94143 SUNWARY S t e r o i d s w i t h d i a z o and a z i d o f u n c t i o n a l groups were l a b e l e d w i t h t r i t i u m atoms by microwave d i scharge a c t i v a t i o n o f t r i t i u m g a s . T
## Abstract The ^13^C NMR spectra of 29 highly oxygenated C, steroids with the withanolide skeleton, 24 of which are naturally occurring substances or acetates thereof, were recorded and the carbon signals fully assigned. The shifts of the heavily functionalized A/B ring system can serve as a βfing
Hydrocortisone, 21-desoxy-Ya~~uoro-6a-methylprednisolone, and ba-nietliylprednisolone, 21-acetate were labeled with tritium by the Wilzbach tritium-gas exposure method. The latter compourid was also tritiated by exposure to tritium gas in the presence of a platinumblack catalyst. Although extensive
A number of monomers have been tritiated to reasonably high specific activity (in the range 2-30 mCi/mmol) using a variety of synthetic and catalytic procedures and the tritium distribution in the products analyzed by 3H-NMR spectroscopy.
## Abstract A separation of four structurally similar steroids was performed on two calix[8]arene based stationary phases. It was observed that two of the steroids had a reversed retention order when the columns were changed. This implies that two different retention mechanisms are taking place whe