Cyclic phosphorus compounds, 6H-dibenz[c,e][1,2]oxaphosphorin-6-oxide derivatives, were efficiently synthesized by the Friedel–Crafts reaction of 2-hydroxybiphenyls with phosphorus trichloride in the presence of superacids, especially trifluoromethanesulfonic acid (TfOH) as a catalyst. TfOH was investigated for the first time as an effective catalyst for the aromatic phosphination of 2-hydroxybiphenyls.

中文翻译：

---

三氯化磷对 2-羟基联苯的超强酸催化 Friedel-Crafts 膦化反应

在超强酸，尤其是三氟甲磺酸存在下，通过 2-羟基联苯与三氯化磷的 Friedel-Crafts 反应，高效合成了环状磷化合物 6H-二苯并 [c,e][1,2] oxaphosphorin-6-oxide 衍生物。 TfOH)作为催化剂。首次研究了 TfOH 作为 2-羟基联苯芳族膦化反应的有效催化剂。