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.

CAS registry number PubChem Vapor pressure Dangerous Substances Directive (67/548/EEC) Chemical classification Integrated Authority File
10199
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