|Molecular mass||180.18 g/mol|
|Melting point||174-177 °C|
|Boiling point||xx.x °C|
|Disclaimer and references|
Phenazine (C12H8N2 or C6
|Molecular mass||180.18 g/mol|
|Melting point||174-177 °C|
|Boiling point||xx.x °C|
|Disclaimer and references|
Phenazine (C12H8N2 or C6H4N2C6H4), also called azophenylene, dibenzo-p-diazine, dibenzopyrazine, and acridizine, is a dibenzo annulated pyrazine and the parent substance of many dyestuffs, such as the eurhodines, toluylene red, indulines and safranines.
A classic method for the synthesis of phenazine is the reaction of nitrobenzene and aniline in the Wohl-Aue reaction (1901). Other methods are known.
- Phenazene may be obtained by distilling the barium salt of azobenzoate
- by passing aniline vapor over lead oxide
- or by the oxidation of dihydrophenazine, which is prepared by heating pyrocatechin with o-phenylenediamine.
- It is also formed when ortho-aminodiphenylamine is distilled over lead peroxide.
- The more complex phenazines, such as the naphthophenazines, naphthazines and naphthotolazines, may be prepared by condensing ortho-diamines with ortho-quinones  or by the oxidation of an ortho-diamine in the presence of α-naphthol, and by the decomposition of ortho-anilido-(-toluidido- et cetera)- azo compounds with dilute acids.
- If alkyl or aryl-ortho-diamines be used, azonium bases are obtained. The azines 