methylaniline

'''N-Methylaniline (NMA)''' is an aniline derivative. It is an organic compound with the chemical formula C6H5NH(CH3). The substance is a colorless viscous liquid, Samples turn brown when exposed to air. The chemical is insoluble in water. It is used as a latent and coupling solvent and is also used as an intermediate for dyes, agrochemicals and other organic products manufacturing. NMA is toxic and exposure can cause damage to the central nervous system and can also cause liver and kidney failure. The comprehensive evaluation of N-methylaniline by the Bureau for Chemical Substances in Poland, completed in 2024 as a part of the European Union's REACH regulation, has confirmed significant concerns regarding the carcinogenicity and mutagenicity of N-methylaniline.

== Use as a fuel additive == N-Methylaniline is a principal component of NMA (monomethylaniline), a non-traditional antiknock agent increasingly used by petroleum refiners and fuel distributors around the world to increase the octane number of gasoline petrol. It is usually added to gasoline in concentration of around 1.3% volume to avoid high gum levels that can cause increased carbon deposits in engine parts . Higher concentrations are permitted by most regulatory agencies if a detergent and a fuel combustion modifier are added to the component to keep gum formation from happening. NMA blended in those concentrations to gasoline / petrol is not more toxic than the hundreds of chemicals that compose this fuel .