3,3'-Dichlorobenzidine
aromatic chemical compound
3,3'-Dichlorobenzidine is a chlorinated aromatic amine derived from benzidine. It is widely used in the production of diarylide yellow pigments used in the production of printing inks. Its use in the production of dyes has been largely discontinued because of concerns about carcinogenicity.
Properties and the market
3,3'-Dichlorobenzidine is a crystalline solid soluble in alcohol, benzene, diethyl ether, and glacial acetic acid, but difficultly soluble in dilute hydrochloric acid and water. It exists in gray-to-purple needle-like crystals. Commercial powder samples may also be light-brown or violet.
This compound is often confused with its dihydrochloride salt, even in scientific literature. 3,3'-Dichlorobenzidine dihydrochloride is sparingly soluble in water and readily soluble in alcohol. It is marketed in the form of a colorless to pale gray crystalline powder. Both the commercial 3,3'-dichlorobenzidine and its hydrochloride usually contain 5 to 30% of water.
This brief starts where responsible research should: with the source description of “3,3'-Dichlorobenzidine” as aromatic chemical compound. Everything that follows is an evidence route, not borrowed authority.
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This entry incorporates text from “3,3'-Dichlorobenzidine” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.