M-Phenylene diamine HCl is a compound, a derivative of phenol with properties typical for aromatic amines, it can be easily dissolved in water and alcohols, but it slowly loses its solubility on heating or by exposure to light, but not in chloroform or carbon tetrachloride.

It is a diamine derivative made of ammonia and m-phenylenediamine.

It's produced by the reaction of these two compounds in liquid ammonia, sulfuric acid, or hydrochloric acid. Also known by its common name, m-phenylenediamine, it is a white crystalline solid.

The chemical is an aromatic diamine derivative. It has been used as a reducing agent in organic synthesis.

• M-Phenylene diamine HCl is a commonly used compound in the polymer industry and is a precursor in m-phenylenediamine(m-DPA) production.
• It is a precursor to many commercial products such as nylon, specialty fibers, adhesives, and resins. It ​is a building block for many beneficial heterocyclic compounds.
• This chemical is an essential intermediate for the synthesis of various derivatives and applications as any of the following: as an HCl salt as a photoacid generator as an acid scavenger as a fluorescent dye as a building block in heterocyclic chemistry as an intermediate to the synthesis of quinazoline derivatives to the synthesis of organic pigments as an intermediate to the synthesis of agricultural chemicals as a medium to the synthesis of plant protection chemicals and as a medium to the synthesis of quinoxalines and phthalazines.