Tolidine
2-Tolidine is an organic compound with the chemical formula. Several isomers are known; the 3-tolidine derivative is also important commercially. It is a colorless compound although commercial samples are often colored. It is slightly soluble in water. It forms salts with acids, such as the hydrochloride, which is commercially available.
2-Tolidine can be produced by benzidine rearrangement from a hydrazone derivative of 2-nitrotoluene.
Uses
2-Tolidine is an aromatic amine used mainly for dye production. 2-Tolidine is an intermediate for the production of soluble azo dyes and insoluble pigments used particularly in the textile, leather and paper industries.Image:PigYel16dichlorophenylediaso.svg|thumb|left|200px|Pigment Yellow 16, a derivative of o-tolidine
It is also used for the production of certain elastomers.
[image:Orthotolidine_in_swimming_pool_chlorine_level_test_kit.jpg|thumb|left|200px|Orthotolidine in chlorine test kit]
2-Tolidine was widely used as a reagent or indicator in analytical, clinical and forensic chemistry, such as in the analytical determination of gold, or determination of the chlorine level in swimming pool water.