The Reactivity of Cyameluric Chloride C6N7Cl3 towards Phosphines and Phosphine Oxides

Organophosphines ( R 2 PH) and phosphineoxides ( R 2 OPH) show a very high reactivity towards cyameluric chloride C 6 N 7 Cl 3 . For example, 2,4,6‐trisdiphenylphosphino‐tri‐ s ‐triazine ( 1 ) forms quantitatively within a few seconds. Tris‐diphenylphosphinsulfide‐ s ‐heptazine ( 2 ) was obtained by reaction of 1 with sulfur. These compounds represent a new class of s ‐heptazine derivatives which tend, unlike their s ‐triazine analogues, to decompose in solution. 1 forms crystals with nitromethane, which were analysed by single‐crystal X‐ray diffraction. The nitromethane molecules fill the gaps in the crystal lattice supported by hydrogen bonds, C–H ··· π ring, and N–O ··· π ring interactions. All compounds were characterized by 1 H, 13 C and 31 P NMR and vibrational (FT‐IR, Raman) spectroscopy. The thermal stability of selected derivatives was measured by TG, indicating surprisingly low thermal decomposition temperatures.