Novel 3-acyloxymethyl-cephem compounds of the formula: ##STR1## wherein R.sup.1 is hydrogen or an acyl group; W is acetonyl, or a group represented by --X--COOH or --X--OH (X is an organic residue) or salts thereof were found to be useful as starting materials for preparing cephalosporins of the formula: ##STR2## wherein R.sup.3 stands for a residue nucleophilic compound and R.sup.1 has the same meaning as above.
公式为 ##STR1## 的新型3-酰氧甲基
头孢菌素化合物,其中R1为氢或酰基;W为乙酰基,或由—X—COOH或—X—OH(X为有机残基)表示的基团或其盐,被发现可作为制备公式为 ##STR2## 的
头孢菌素的起始材料,其中R3代表一个亲核化合物残基,R1的含义如上。