aromatic series

Aromatic compounds are a class of unsaturated chemical compounds characterized by planar rings of atoms with unique stability, known as aromaticity. The simplest and best-known aromatic compound is benzene (C₆H₆), which consists of a hexagonal ring of six carbon atoms.1

Historically, aromatic compounds were derived from fragrant substances, but the term now refers to compounds structurally related to benzene. While coal was once the primary source, petroleum is now the main source of aromatic hydrocarbons. These compounds, including benzene, toluene, and xylenes, are produced through processes like catalytic reforming.23

Aromatics are crucial in the petrochemical industry, serving as building blocks for plastics, fibers, dyes, and drugs. They are also components of gasoline, contributing to its octane rating. Although present in crude oil, aromatics typically constitute a small percentage of most crude oil mixtures.234