Pentazol is an aromatic five-membered system consisting of 5 nitrogen atoms. Despite the absence of carbon atoms, this system has historically been traditionally considered in the chemistry of organic heterocyclic compounds in a series of five-membered rings with the number of nitrogen atoms n from one to five: pyrrole ( n = 1), pyrazole and imidazole ( n = 2), triazoles ( n = 3), tetrazole ( n = 4) and pentazole ( n = 5). In free form, not obtained, only hydrogen substitution products for aromatic groups are known.
| Pentazole | |
|---|---|
 | |
| General | |
| Systematic name | Pentazole |
| Chem. formula | Hn 5 |
| Physical properties | |
| Molar mass | 71.0414 g / mol |
| Classification | |
| Reg. CAS number | |
| PubChem | |
| Smiles | |
| Inchi | |
| ChemSpider | |
Content
- 1 Pentazole Salts
- 2 Aromatic pentazole derivatives (arylpentazoles)
- 2.1 Receiving
- 2.2 Sustainability
- 3 notes
- 4 Literature
Pentazole Salts
In 2017, an article was published that Chinese scientists were able to obtain hydrated forms of salts containing the pentazolate anion N 5 - and a cation of magnesium , sodium , iron , manganese , cobalt or ammonium [1] . The compounds obtained were unusually stable.
Aromatic pentazole derivatives (arylpentazoles)
Getting
Obtained by the interaction of diazonium salts with metal azides at low temperatures.
Sustainability
All known derivatives are unstable and, when heated, nitrogen is cleaved to form aryl azides. Stability increases with the introduction of electron-donating substituents in the carbon aromatic ring. Unsubstituted phenylpentazole decomposes at 0 ° C, 4-dimethylaminophenylpentazole at 50 ° C.
Notes
Literature
- Katritzky AR, Rees CW Comprehensive heterocyclic chemistry. - Vol. 5. - 1997, pp. 839-845.