Intermediates of the following formula are disclosed: ##STR1## wherein R.sup.1 is aryl; R.sup.2 is carboxy or protected carboxy; Z.dbd.CH.dbd.CH.sub.2, CH.sub.2 --X.sup.2, --CH.sub.2 --P.sup.+ (R.sup.7).sub.3 .X.sup.3 or CH .dbd.P(R.sup.7).sub.3 wherein X.sup.2 and X.sup.3 are each halogen and R.sup.7 is aryl. The compounds are useful as intermediates for cephalosporins.
以下公式的中间体已被披露:##STR1## 其中R.sup.1是芳基; R.sup.2是羧基或受保护的羧基; Z.dbd.CH.dbd.CH.sub.2,CH.sub.2--X.sup.2,--CH.sub.2--P.sup.+(R.sup.7).sub.3 .X.sup.3或CH.dbd.P(R.sup.7).sub.3,其中X.sup.2和X.sup.3均为卤素,R.sup.7为芳基。这些化合物可用作
头孢菌素的中间体。