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Pigment Brown 27

Catalog Number DYE-PIG-0266
CAS Number 3989-75-1
Structure
Synonyms Brown 2R, Red Brown G, Mramorin Bordeaux
Molecular Weight 396.48
Molecular Formula C24H12O2S2
CI Number C.I.73410
Color brown.
Main Molecular Structure Thioindigo
Preparation Method Naphtho[2,1-b]thiophen-1(2H)-one oxidation. The intermediate is used in Chlorobenzene Phosphorus trichloride or Thionyl chloride make 2-(Naphthalen-2-ylthio)acetic acid and closed loop (BIOS986, 260; FIAT 764).
Properties Not soluble in ethanol, slightly soluble in xylene as red jujube. In concentrated sulfuric acid to dark brown, and then into blue, dilution for blue; In the basic insurance powder solution for red yellow; In the acidic insurance powder solution for light brown.

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