PH ylides such as H₂C=PH₃ are considerably higher in energy than their corresponding phosphines H₃C−PH₂. Using bis(sulfonyl)methyl substituents, the first PH ylides stable at ambient conditions could be isolated in solution and in the solid state. They are ideal precursors to carbanionic phosphines with exclusive phosphine reactivity and thus to highly electron-rich phosphines.

中文翻译：

---

从稳定的 PH-叶立德到用作两性离子催化剂配体的 α-碳负膦

诸如H ₂ C=PH _{3的PH叶立德的能量比它们相应的膦H 3} C-PH ₂高得多。使用双(磺酰基)甲基取代基，可以在溶液和固态中分离出在环境条件下稳定的第一个PH叶立德。它们是具有独特膦反应性的碳阴离子膦的理想前体，因此是高度富电子的膦的理想前体。