Aromatics are a type of hydrocarbon that contains a ring structure, such as benzene and toluene. They can be found for instance in gasoline and are capable of burning with sooty flames. The percentage of carbon within aromatic compounds is much higher than in other compounds such as aliphatic. They are cyclic with alternative single and double bonds which negate the chances of being targeted by normal oxidizing or reducing agents.

Aromatic compounds do not experience addition reactions in standard conditions and deliver substitution reactions easily. Other characteristics of aromatic compounds are thermal stability and chemical behavior. Thermal stability gives aromatics more heat absorption capacity compared to other compounds that release greater amounts of heat through the combustion process. Chemical behavior is the process that will be presented for particular agents or reactants