Reactions of Phosphorous Substituted Carbodiimides

Addition of hydrogen chloride or hydrogen cyanide to P-substituted carbodiimides affords the adducts 33 (X = Cl or CN).2  

The reactions of the bis-phosphino carbodiimide 34 with acetylenes afford [2+3] cycloadducts 35.  

With two equivalents of the same acetylene derivative a bicyclic P-compound 36 is obtained. 

Kaiser, H. Hartung and R. Richter, Z. Anorg. Allg. Chem. 469, 188 (1980) 

Tomaschewski, B. Breitfeld andD. Zanke, Tetrahedron Lett. 3191 (1969) 

---