Intermediate cefdinir salts

** ** Salts formula in which: R1 is hydrogen or an amino-protecting group selected from a C1-C6 acyl group optionally substituted by one or more chlorine or fluorine atoms, an alkyl- or aryl-oxycarbonyl or a trityl group wherein each benzene ring is optionally substituted with one or more methoxy groups and / or methyl; R2 is a hydroxy protecting group selected from an alkyl group linear or branched C1-C6 alkyl, benzyl, benzhydryl, or trityl wherein each benzene ring is optionally substituted with one or more methoxy, nitro and / or methyl ; B is ammonia or an organic base selected from primary amines, secondary amines, tertiary amines, guanidine, amidines; solvates or adducts thereof.