4-Nitro-o-phenylenediamine (CAS: 99-56-9) is an organic chemical compound featuring a benzene ring with two amino groups (-NH2) at the 1 and 2 positions, and a nitro group (-NO2) at the 4-position. This compound is typically a yellow crystalline powder that is slightly soluble in water and more soluble in organic solvents like alcohols.

Applications:

4-Nitro-o-phenylenediamine is primarily used as an intermediate in the manufacture of azo dyes, as well as in the production of other organic chemicals, including those used in the rubber and photographic industries. It also serves as a corrosion inhibitor in some chemical processes.

Properties:

• It has a nitro group that imparts certain reactivity, making it useful in synthetic chemistry.
• As an aromatic diamine, it plays a key role in producing a variety of derivatives and formulations in both industrial and laboratory settings.

This compound is handled with caution due to its toxic nature and potential health hazards such as skin and eye irritation. Proper safety measures, including personal protective equipment, are necessary when handling it in any capacity.