3NH4Cl + 3BCl3 B3N3H3Cl3 + 9HCl
or
3NH4Cl + 3BCl3 (BClNH)3 + 9HCl [16]
Ammonium chloride react with boron chloride to produce trichloridoborazine and hydrogen chloride. This reaction takes place at a temperature of 140-150°C, catalyst - C6H6, C6H5Cl.