The synthesis of ^14^C Norfenfluramine is described. The starting materials ^14^C‐Trifluoromethylbenzoic acid and ^14^C bistrifluoromethyl‐3‐benzophenone were prepared by carbonation of appropriate Grignard reagents. The labelled benzophenone was oxidized in high yield to give ^14^C‐trifluoromethylb
Synthese Amelioree de la Progesterone 14C-4
✍ Scribed by H. Hoellinger; Nguyen-Hoang-Nam; L. Pichat
- Publisher
- John Wiley and Sons
- Year
- 1974
- Tongue
- French
- Weight
- 262 KB
- Volume
- 10
- Category
- Article
- ISSN
- 0022-2135
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
La synthèse améliorée de la progestérone ^14^C‐4 est décrite. La purification de la progestérone ^14^C‐4 par chromatographie sur colonne de silicate de Mg et CCM préparative a permis l'isolement de deux sous‐produits: isoprogestérone ^14^C‐4 et trioxo‐3,5,20‐seco A‐4,5 pregnane ^14^C‐4, identifiés par spectrométrie RMN et de masse. Rendement radioactif global: 40% par rapport à ^14^CO~3~Ba, activité spécifique: 59 mCi/mM.
📜 SIMILAR VOLUMES
## Abstract La synthèse de la dl‐noréphédrine (méthyle ^14^C) en deux stades, à partir de l'α‐N, N‐dibenzylaminoacétophénone et de I^14^CH~3~ est décrite. Après purification par chromatographie sur résine échangeuse d'ions AG 50 W‐X2 on obtient la dl‐noréphédrine (méthyle ^14^C) HCl avec un rendeme
## Abstract Carbonation with ^14^CO~2~ of penylethynyl‐lithium has given rise to (carboxyl‐^14^C) phenylpropiolic acid with 75 % yield based on ^14^CO^2^. The latter condensed with 2‐naphthol by treating with polyphosphoric acid afforded (4‐^14^C) β‐naphthoflavone, purified by silicagel low pressur
## The synthesis of [ 4-14C]nisoldipine started from dimethyl [ 14C] formamide which was allowed to react with 2-nitrophenyllithium yielding 2-nitro [ 7-14C] benzaldehyde . Knovenagel condensation with isobutyl acetoacetate yielded isobutyl 2-(2-nitr0[7-~~C]benzylidene) acetoacetate. Key reaction
## Abstract (ring‐4,6‐^14^C) Pentamethylmelamine (^14^C‐PMM), a new antitumor agent, was prepared from barium (^14^C) carbonate by a 6 step synthesis. (^14^CN) Dimethylcyanamide, prepared from sodium (^14^C) cyanide with 71% yield and treated with phosgene in the presence of hydrogen chloride, was
## I -d e m e t h y l c o l c h i c i n e o b t a i n e d b y s e l e c t i v e d e m e t h y l a t i o n o f c o l c h i c i n e w a s c o n d e n s e d w i t h ('4C)CH, I t o g a v e ( 1m e t h o x y 1 4 C ) c o l c h i c i n e 4. A f t e r t w o p u r i f i c a t i o n s b y s i l i c a g e l c o