Two new types of iso-oxacephems have been synthesized in which a phosphonate group replaces either the carboxyl group or C(3). The latter compound exists as a stable trialkoxyphosphonium ylide.
已经合成了两种新型的异氧杂草醚,其中
膦酸酯基团取代了羧基或C(3)。后一种化合物以稳定的三烷氧基phosph叶立德存在。