toluene tōl´yo͞oēn˝ [key] or methylbenzenemĕth˝əlbĕn´zēn [key], C7H8, colorless liquid aromatic hydrocarbon that melts at −95°C and boils at 110.8°C. It is insoluble in water but highly soluble in most organic solvents. Toluene is obtained from coal tar and petroleum by distillation. It is used as a solvent and as a starting material for the synthesis of many compounds, including dyes and explosives. When toluene is treated with a mixture of nitric and sulfuric acids (a process known as nitration), trinitrotoluene (TNT) is produced.
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