pentazine
{{For|the pharmaceutical drug with the brand name Pentazine|promethazine}}
{{chembox
| Verifiedfields = changed
| Watchedfields = changed
| verifiedrevid =
| ImageFile = Pentazine.svg
| ImageSize = 100px
| PIN = Pentazine
| OtherNames =
|Section1={{Chembox Identifiers
| CASNo_Ref = {{cascite|correct|??}}
| CASNo = 290-97-1
| PubChem = 6451471
| SMILES = C1=NN=NN=N1
| SMILES1 = c1nnnnn1
| InChI =
| ChEBI_Ref = {{ebicite|correct|EBI}}
| ChEBI =
| ChemSpiderID_Ref = {{chemspidercite|correct|chemspider}}
| ChemSpiderID = 4953936
}}
|Section2={{Chembox Properties
| C=1 | H= 1 | N= 5
}}
}}
Pentazine is a hypothetical chemical compound that consists of a six-membered aromatic ring containing five nitrogen atoms with the molecular formula CHN5. The name pentazine is used in the nomenclature of derivatives of this compound.
Pentazine is predicted to be unstable and to decompose into hydrogen cyanide (HCN) and nitrogen (N2).{{Cite book | doi = 10.1016/B978-008096518-5.00138-6 | chapter = Other Tetrazines and Pentazines | title = Comprehensive Heterocyclic Chemistry II | pages = 957–965 | year = 1996 | last1 = Hurst | first1 = Derek T. | isbn = 9780080965185 }} The activation energy required is predicted to be around 20 kJ/mol.
{{cite journal
|author = J. Fabian and E. Lewars
|year = 2004
|title = Azabenzenes (azines) — The nitrogen derivatives of benzene with one to six N atoms: Stability, homodesmotic stabilization energy, electron distribution, and magnetic ring current; a computational study
|url = http://pubs.nrc-cnrc.gc.ca/rp/rppdf/v03-178.pdf
|journal = Canadian Journal of Chemistry
|volume = 82
|issue = 1
|pages = 50–69
|doi = 10.1139/v03-178
|url-status = dead
|archiveurl = https://web.archive.org/web/20050329185413/http://pubs.nrc-cnrc.gc.ca/rp/rppdf/v03-178.pdf
|archivedate = 2005-03-29
}}