Boric acid

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As Boron azides or Azidoborane refers to a group of chemical compounds , the at least one covalently bound to the boron -bonded azide group contain. The group includes the monoazidoboranes with the general formula R 2 BN 3 , the diazidoboranes RB (N 3 ) 2 and the boron triazide B (N 3 ) 3 . Both organic and inorganic substituents can represent the substitution R. In addition, salts of tetraazidoborates [B (N 3 ) 4 ] - are known.

history

The first synthesis of a boron azide, the compounds boron triazide B (N 3 ) 3 and lithium tetraazidoborate Li [B (N 3 ) 4 ] was achieved by Egon Wiberg in 1954. The synthesis and the subsequent chemistry were essentially further developed by Peter Paetzold .

Manufacturing

Borazides can be classified according to the general reaction equation

produce. Lithium azide or trimethylsilyl azide are preferably used as azidating agents . Toluene or dichloromethane , for example, serve as solvents . Volatile components can be removed in vacuo. The cleaning takes place, for example, by recrystallization.

Reactions

As Lewis acids , the boron azides form adducts with Lewis bases such as pyridine when appropriately substituted . Dichloroborazide reacts at 200 ° C. with elimination of nitrogen to form hexachloroborazole . Borazides are often explosive and must be handled with extreme care.

Individual evidence

  1. ^ Wiberg, E .; Michaud, H .: On the knowledge of a boron triazide in Z. Naturforsch. B 9 (1954) 497-499, doi : 10.1515 / znb-1954-0715 (accessed via De Gruyter Online).
  2. ^ Wiberg, E .; Michaud, H .: On the knowledge of an ether-soluble lithium borazide LiB (N 3 ) 4 in Z. Naturforsch. B 9 (1954) 499, doi : 10.1515 / znb-1954-0716 (accessed via De Gruyter Online).
  3. ↑ P. Paetzold: In: Adv Inorg Chem ., 1987, 31, 123-170.
  4. ^ P. Paetzold: Contributions to the chemistry of the boron azides. I. On the knowledge of dichloroborazide in: Journal for inorganic and general chemistry, 326, pp. 47-52.

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