Pyronines

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Pyronine is the collective name for cationic xanthene dyes . They can be derived from diphenylmethine dyes. Nowadays, apart from pyronine G, they no longer have any technical significance.

Representative

The cationic xanthene dyes include pyronine G and pyronine B , for example .

  • Pyronine G.

  • Pyronine B

use

Pyronin G is used together with methyl green in microscopy for Unna-Pappenheim staining . This as well as Pyronin B can also be used as laser dyes .

Manufacturing

A pyronine is obtained by first reacting formaldehyde with 3- (alkylamino) phenols . The leuco compound obtained is then cyclized to pyronine by oxidation with nitrous acid and with elimination of water .

Individual evidence

  1. ↑ a b c Entry on Pyronine. In: Römpp Online . Georg Thieme Verlag, accessed on June 15, 2020.
  2. ↑ External identifiers or database links for pyronin B : CAS number: 2150-48-3, EC number: 218-429-9, ECHA InfoCard: 100.016.755 , PubChem : 16524 , ChemSpider : 15664 , Wikidata : Q27162518 .