Synthesis of borazine

Patent Pending The compound was reported in 1926 by the chemists Alfred Stock and Erich Pohland by a reaction of diborane with ammonia.[2] Borazine is synthesized from diborane and ammonia in a 1:2 ratio at 250–300 °C with a conversion of 50%. 3 B2H6 + 6 NH3 → 2 B3H6N3 + 12 H2 An alternative more efficient route begins with lithium borohydride and ammonium chloride: 3 LiBH4 + 3 NH4Cl → B3H6N3 + 3 LiCl + 9 H2 In a two-step process to borazine, boron trichloride is first converted to trichloroborazine: 3 BCl3 + 3 NH4Cl → Cl3B3H3N3 + 9 HCl The B-Cl bonds are subsequently converted to B-H bonds: 2 Cl3B3H3N3 + 6 NaBH4 → 2 B3H6N3 + 3 B2H6 + 6 NaCl