1,2,3-Trimethylbenzene

1,2,3-Trimethylbenzene

Names
IUPAC name 1,2,3-Trimethylbenzene
Other names Hemellitol; Hemimellitol, Hemimelithol; Hemimellitine; Hemimellitene
Identifiers
CAS Number	526-73-8 Y
3D model (Jmol)	Interactive image
ChEBI	CHEBI:34037 Y
ChemSpider	10236 Y
ECHA InfoCard	100.007.633
PubChem	10686
RTECS number	DC3300000
InChI InChI=1S/C9H12/c1-7-5-4-6-8(2)9(7)3/h4-6H,1-3H3 Y Key: FYGHSUNMUKGBRK-UHFFFAOYSA-N Y InChI=1S/C9H12/c1-7-5-4-6-8(2)9(7)3/h4-6H,1-3H3
SMILES c1(cccc(c1C)C)C
Properties
Chemical formula	C9H12
Molar mass	120.20 g·mol−1
Appearance	Colorless liquid[1]
Density	0.89 g/mL[1]
Melting point	−25 °C (−13 °F; 248 K)[1]
Boiling point	176 °C (349 °F; 449 K)[1]
Solubility in water	0.006% (20°C)[2]
Vapor pressure	1 mmHg (16.7°C)[2]
Hazards
Main hazards	Flammable[3]
R-phrases	R10 R37
S-phrases	S16
Flash point	51 °F (11 °C)[1]
Autoignition temperature	470 °F (243 °C)[1]
Explosive limits	0.8%-6.6%[2]
US health exposure limits (NIOSH):
PEL (Permissible)	none[2]
REL (Recommended)	TWA 25 ppm (125 mg/m3)[2]
IDLH (Immediate danger)	N.D.[2]
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

1,2,3-Trimethylbenzene is an organic compound with the chemical formula C₆H₃(CH₃)₃. Classified as an aromatic hydrocarbon, it is a flammable colorless liquid. It is nearly insoluble in water but soluble in organic solvents. It occurs naturally in coal tar and petroleum. It is one of the three isomers of trimethylbenzene. It is used in jet fuel, mixed with other hydrocarbons, to prevent the formation of solid particles which might damage the engine.

Production and uses

Industrially, it is isolated from the C₉ aromatic hydrocarbon fraction during petroleum distillation. It is also generated by methylation of toluene and xylenes.^[4]

References