3,3'-Dimethylbenzidine dihydrochloride (o-Tolidine dihydrochloride) (612-82-8)

 3,3'-Dimethylbenzidine dihydrochloride , with CAS number of 612-82-8, can be called [1,1'-Biphenyl]-4,4'-diamine, 3,3'-dimethyl-, dihydrochloride ; 3,3'-Dimethyl-4,4'-biphenyldiamine dihydrochloride ; 3,3'-Dimethylbenzidine dihydrochloride . It is a light beige to grey-beige crystalline powder, be soluble in water. The resulting solutions contain moderate to high concentrations of hydrogen ions and have pH's of less than 7.0. They react as acids to neutralize bases. These neutralizations generate heat, but less or far less than is generated by neutralization of inorganic acids, inorganic oxoacids, and carboxylic acid. They usually do not react as either oxidizing agents or reducing agents but such behavior is not impossible. Many of these compounds catalyze organic reactions.

Reported in NTP Carcinogenesis Studies (Drinking); Clear Evidence: rat NTPTR*    National Toxicology Program Technical Report Series. (Research Triangle Park, NC 27709) No. NTP-TR-390 ,1991. . Reported in EPA TSCA Inventory.