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ChemicalBook CAS DataBase List DIBENZANTHRONE
116-71-2

DIBENZANTHRONE synthesis

15synthesis methods
Violanthrone of high purity is obtained from 4,4'-bibenzanthronyl (153) by alkaline or acid ring closure, preferably in the presence of oxidizing agents , . If this ring closure is carried out in sulfuric acid with an excess of manganese dioxide, the 16,17- violanthronequinone (155) is obtained. This can be reduced readily with sodium hydrogen sulfite to 16,17-dihydroxyviolanthrone (156). Subsequent alkylation of the hydroxy groups yields very fast navy-blue to brilliant-green vat dyes. The dimethyl ether (157) is the well-known dye Caledon Jade Green or Indanthren Brilliant Green B and FFB (extremely pure form).
Synthesis_116-71-2
-

Yield:-

Steps:

Multi-step reaction with 2 steps
1: sodium anilide; aniline / 5 - 12 °C
2: sulfuric acid; mercury (II)-sulfate / 200 - 240 °C

References:

Luettringhaus;Neresheimer [Justus Liebigs Annalen der Chemie,1929,vol. 473,p. 278]

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