| abstract |
A cephalosporin intermediate of the formula ##STR1## where R 3 is carboxyl, carboxylate, or a carboxylic acid ester group and, n R 8 and R 9 are each independently hydrogen, halogen, n (C 1-4 ) alkyl, hydroxy, carboxamido, n (C 1-4 ) alkoxycarbonyl, amino, n mono- (C 1-4 ) alkylamino, di- (C 1-4 ) alkylamino, or n together are a 5 or 6-membered carbocyclic ring or an alkali metal, alkaline earth metal, or acid addition salt thereof. Valuable cephalosporin antibiotics can be produced from the cephalosporin intermediate products of formula I. |