The invention relates to a process for the preparation of 3-phosphoniummethyl-3-cephem compounds of the formula: ##STR1## wherein R.sub.3 is aryl, or a salt thereof, which is characterized by reacting one equimolar amount of a 3-hydroxymethyl-3-cephem compound of the formula: ##STR2## or a salt thereof, with two or a little over two equimolar amount of triarylphosphine and one or a little over one equimolar amount of iodine, said prepared compounds being useful as intermediates for manufacturing 3-vinyl-3-cephem compounds possessing potent antimicrobial activities.
本发明涉及一种制备3-
磷酸甲基-3-
头孢菌素化合物的方法,其
化学式为:##STR1## 其中R.sub.3为芳基或其盐。该方法的特点在于,将一摩尔的3-羟甲基-3-
头孢菌素化合物的
化学式:##STR2## 或其盐与两摩尔或略多于两摩尔的三芳基膦和一摩尔或略多于一摩尔的
碘反应,制备的化合物可用作制造具有强效抗微
生物活性的3-
乙烯基-3-
头孢菌素化合物的中间体。