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Names | |||
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Preferred IUPAC name
1,3,5-Trimethylbenzene[1] | |||
Other names
Mesitylene[1]
sym-Trimethylbenzene | |||
Identifiers | |||
3D model (JSmol)
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ChEBI | |||
ChemSpider | |||
ECHA InfoCard | 100.003.278 | ||
EC Number |
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KEGG | |||
PubChem CID
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UNII | |||
UN number | 2325 | ||
CompTox Dashboard (EPA)
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Properties | |||
C9H12 | |||
Molar mass | 120.19 g/mol | ||
Appearance | Colorless liquid[2] | ||
Odor | Distinctive, aromatic[2] | ||
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)[2] | |||
Vapor pressure | 2 mmHg (20°C)[2] | ||
-92.32·10−6 cm3/mol | |||
Structure | |||
0.047 D[3] | |||
Hazards | |||
Flash point | 50 °C; 122 °F; 323 K[2] | ||
NIOSH (US health exposure limits): | |||
PEL (Permissible)
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none[2] | ||
REL (Recommended)
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TWA 25 ppm (125 mg/m3)[2] | ||
IDLH (Immediate danger)
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N.D.[2] | ||
Safety data sheet (SDS) | [1] | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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.[4]
Ullmanns
was invoked but never defined (see the help page).