The present invention relates to depleting E-isomers of 3-(2-substituted vinyl) cephalosporins from a Z/E mixture of the same by selective crystallization techniques. The present invention to Z-enriched compounds comprising less than 5 % E-isomer.
本发明涉及通过选择性结晶技术从同种Z/E混合物中消耗3-(2-取代
乙烯基)
头孢菌素的E异构体。本发明涉及含量低于5% E异构体的Z富集化合物。