There are presented compounds of the formula ##STR1## wherein R.sup.1 is one of the 3-substituents usable in cephalosporin chemistry, R.sup.2 is hydrogen, lower alkyl or COOR.sup.3 -lower alkyl, wherein R.sup.3 is hydrogen, a cation of a base or a readily hydrolyzable ester group, and X is sulphur, oxygen or one of the groups --SO-- and --SO.sub.2 --, and the readily hydrolyzable esters, readily hydrolyzable ethers and salts of these compounds and hydrates of the compounds of formula I or of their esters, ethers and salts, also presented are methods for the manufacture of these compounds as well as compounds used in their manufacture.
                            公式##STR1##中呈现了化合物,其中R.sup.1是
头孢菌素化学中可用的3-取代基之一,R.sup.2是氢、较低的烷基或COOR.sup.3-较低的烷基,其中R.sup.3是氢、一种碱的阳离子或易
水解的酯基团,X是
硫、氧或--SO--和--SO.sub.2--中的一种基团,以及这些化合物的易
水解酯、易
水解醚和盐,以及公式I的化合物或其酯、醚和盐的
水合物,还提供了制造这些化合物的方法以及用于制造它们的化合物。