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Reaction between tris(dimethylamino)-phosphine, carbon tetrachloride and oximes of ketones leads to the corresponding Oximory-Tris-(Dimethylamino)-Phosphonium salts (OTDP salts), which are isolated in the form of hexafluorophosphates. These salts are solid and stable except if they are completely dehydrated. Their solutions, in non polar solvents like CHCl 3 , give Beckmann rearrangement...
Le polysaccharide capsulaire de Salmonella typhi est un compose hautement antigenique resultant d'un assemblage regulier d'unites acide N-acetyl D-galactosaminuronique reliees en α(1->4) et largement acetylees en position 3. Pour determiner la taille minimale necessaire a la reponse immunitaire, nous avons prepare chimiquement les di, tri, tetra et hexasaccharides correspondants en utilisant comme...
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