The trimethylbenzenes constitute a group of substances of aromatic hydrocarbons, which structure consists of a benzene ring with three methyl groups (–CH3) as a substituent. Through their different arrangement, they form three structural isomers with the molecular formula C9H12. They also belong to the group of C3-benzenes. The best-known isomer is mesitylene.
{| class="wikitable skin-invert-image" style="text-align:center; font-size:90%" |- | class="hintergrundfarbe6" colspan="4" | Trimethylbenzenes |- | class="hintergrundfarbe5" align="left" | Common name | hemimellitene || pseudocumene || mesitylene |- | class="hintergrundfarbe5" align="left" | Systematic names | 1,2,3-trimethylbenzenevic.-trimethylbenzene || 1,2,4-trimethylbenzeneasym.-trimethylbenzene || 1,3,5-trimethylbenzenesym.-trimethylbenzene |- | class="hintergrundfarbe5" align="left" | Structural formula
| class="hintergrundfarbe5" align="left" | CAS Registry Number | 526-73-8 || 95-63-6 || 108-67-8
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