| 摘要 |
<p>New salts of 7-aminocephalosporanic acids of general formula …<CHEM>… wherein R1 is among others H, CH3 or CH3O ; R2 is among others CH3, CH3O, Cl, azidomethyl, carbamoylmethyl, acetoxymethyl, thiomethyl, phenylthiomethyl, aliphatic, aromatic or heteroxyclic methylthiocarbonyl or methylthioheterocycle ; x is 3 to 5; and y is 2 to 4, in solution in an organic solvent, are used in the preparation of cephalosporins.</p> |
