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 of a nucleophilic compound and R.sup.1 has the same meaning as above.
发现具有以下结构的新型3-酰氧甲基
头孢菌素化合物:其中R.sup.1为氢或酰基;W为丙酰基,或由--X--COOH或--X--OH(X为有机残基)代表的基团或其盐,可作为制备以下结构
头孢菌素的起始原料:其中R.sup.3代表亲核化合物的残基,R.sup.1的含义与上述相同。