Mesitylene

Mesitylene or 1,3,5-trimethylbenzene is a derivative of benzene with three methyl substituents positioned symmetrically around the ring. The other two isomeric trimethylbenzenes are 1,2,4-trimethylbenzene (pseudocumene) and 1,2,3-trimethylbenzene (hemimellitene). All three compounds have the formula C6H3(CH3)3, which is commonly abbreviated C6H3Me3. Mesitylene is a colorless liquid with sweet aromatic odor. It is a component of coal tar, which is its traditional source. It is a precursor to diverse fine chemicals. The mesityl group (Mes) is a substituent with the formula C6H2Me3 and is found in various other compounds.

Mesitylene
Names
Preferred IUPAC name
1,3,5-Trimethylbenzene
Other names
Mesitylene
sym-Trimethylbenzene
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.003.278
EC Number
  • 203-604-4
KEGG
UNII
UN number 2325
  • InChI=1S/C9H12/c1-7-4-8(2)6-9(3)5-7/h4-6H,1-3H3 Y
    Key: AUHZEENZYGFFBQ-UHFFFAOYSA-N Y
  • InChI=1/C9H12/c1-7-4-8(2)6-9(3)5-7/h4-6H,1-3H3
    Key: AUHZEENZYGFFBQ-UHFFFAOYAK
  • Cc1cc(cc(c1)C)C
Properties
C9H12
Molar mass 120.19 g/mol
Appearance Colorless liquid
Odor Distinctive, aromatic
Density 0.8637 g/cm3 at 20 °C
Melting point −44.8 °C (−48.6 °F; 228.3 K)
Boiling point 164.7 °C (328.5 °F; 437.8 K)
0.002% (20°C)
Vapor pressure 2 mmHg (20°C)
-92.32·10−6 cm3/mol
Structure
0.047 D
Hazards
Flash point 50 °C; 122 °F; 323 K
NIOSH (US health exposure limits):
PEL (Permissible)
 none
REL (Recommended)
 TWA 25 ppm (125 mg/m3)
IDLH (Immediate danger)
 N.D.
Safety data sheet (SDS)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y verify (what is YN ?)
Infobox references
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