Trimethylbenzenes
The trimethylbenzenes form a group of substances, whose structure consists of a benzene ring with three methyl groups (- CH3) as a substituent. Due to their different arrangement of three structural isomers arise with the molecular formula C9H12. Depending on the position is called vic -. , Asym - or sym -trimethylbenzene. They also belong to the group of C3 - benzenes. The sym -trimethylbenzene, mesitylene is the best known of the three isomers.
Properties
To the group of trimethyl include:
- Hemellitol (1,2,3 -trimethylbenzene )
- Pseudocumene (1,2,4- trimethylbenzene )
- Mesitylene (1,3,5- trimethylbenzene )
The melting points behave more uneven. Unexpectedly, mesitylene. In the highly symmetric in this group representative of the melting point is -45 ° C and is thus even of all three isomers the lowest.