Tolidine

• O-tolidine
• GDL Principal Name: 3,3 '- dimethylbenzidine
• Dimethylbenzidine
• 4,4 ' -diamino-3, 3'- dimethyldiphenyl
• Diaminoditolyl
• 3,3 '- dimethylbiphenyl -4, 4' -diamine
• 4,4 '-di -o-toluidine
• P, p' -diamino- m, m'- dimethyl diphenyl
• German EINECS - Name: 4,4 '-bi -o -toluidine

Colorless to reddish solid

Solid, crystalline

1.23 g · cm -3

129 ° C.

300.5 ° C

• Poorly in water ( 1.3 g · l-1 at 25 ° C)
• Soluble in ethanol, diethyl ether and dilute acids

Risk

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Tolidine, more ortho -tolidine, is a toxic and carcinogenic substance belonging to the group of aromatic amines and the biphenyl derivatives.

Properties

Tolidine forms salts with acids, such as the dihydrochloride is commercially available.

Representation

Tolidine can be prepared analogous to benzidine from ortho Hydrazotoluol by a benzidine rearrangement.

Use

O-tolidine is a major Diphenylbasen and mostly is used for dye preparation and also for the preparation of certain elastomers.

O-tolidine is used primarily as an intermediate for the preparation of soluble and insoluble Bisdiazofarbstoffen pigments which are used in particular in the textile, leather and paper industries. The substance is not released from textiles or leather articles which may come a long time with the human skin directly in contact are (Appendix 1 of the Consumer Goods Ordinance ) after reductive cleavage of azo groups. o -tolidine has also found extensive use as a reagent and indicator in analytical, clinical and forensic chemistry.

Safety

Tolidine decomposes at high temperatures and forms hazardous gases or vapors (nitrogen oxides). In case of contact with oxidizing agents is a risk a strongly exothermic reaction ( heat).

When dealing with tolidine is the eighth largest on cleanliness in the workplace. It may be present at workplaces only the quantities of substances that are necessary for the progress of the work. Vessels are not to leave open. Dustproof closing plants with exhaust filter and hopper are to be used with suction for the filling and transfer. Tight fitting systems made ​​of resistant materials must be used with extraction For the filling of the solution.