Biebrich scarlet

  • 2 - [( 2Z ) -2 - (2- Oxonaphthalin -1 -ylidene) hydrazinyl ] -5 - ( 4 -sulfophenyl) diazenylbenzolsulfonsäure (IUPAC)
  • Imperial scarlet
  • Crocein scarlet
  • Echtponceau B, 3RB or RS
  • Neurot L
  • C. I. 26905
  • Acid Red 066

Dark red solid

Fixed

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Biebrich scarlet is the name for a dis- azo dye. The trade was the disodium salt, a red-brown, in water with a yellow-red color good dissolving powder. It dyes wool and silk cochenilleartig red. Found it was established in 1878 by Rudolf Nietzki and from 1879 at Kalle in Wiesbaden -Biebrich.

Biebrich Scarlet was the first industrially manufactured disazo.

Production

Biebrich scarlet (5 ) is obtained by diazotization of sulfanilic acid (1 ) and subsequent coupling to orthanilic. To prevent the amino group can be triazenes of orthanilic acid by reaction with the adduct of formaldehyde / bisulfite protected (2). The resulting monoazo (3) is coupled rediazotiert and β -naphthol (4).

Swell

  • Otto Lueger: Encyclopedia of the entire technique. 2nd edition, German publishing house, Stuttgart and Leipzig, 1904-1920.
  • Wiesbaden Newspaper of August 15, 2008
CAS registry number PubChem Carmine Biebrich (Wiesbaden)
6279
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