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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.[1][2] 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.[3]
Trimethylbenzenes Common name hemimellitene pseudocumene mesitylene Systematic names 1,2,3-trimethylbenzene
vic.-trimethylbenzene1,2,4-trimethylbenzene
asym.-trimethylbenzene1,3,5-trimethylbenzene
sym.-trimethylbenzeneStructural formula 
CAS Registry Number 526-73-8 95-63-6 108-67-8
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