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Name	1,2,3-Trimethylbenzene	EINECS	208-394-8
CAS No.	526-73-8	Density	0.869 g/cm³
PSA	0.00000	LogP	2.61180
Solubility	65.51mg/L(25 oC)	Melting Point	-25 °C(lit.)
Formula	C₉H₁₂	Boiling Point	176.766 °C at 760 mmHg
Molecular Weight	120.194	Flash Point	53.106 °C
Transport Information	UN 3295 3/PG 3	Appearance	colourless liquid
Safety	16	Risk Codes	10-37
Molecular Structure		Hazard Symbols	Xi
Synonyms	Hemimellitol;NSC 5167;	Article Data	93

1,2,3-Trimethylbenzene Synthetic route

: 52378-83-3
epimino-1,2 trimethyl-3,5,5 cyclohexene-3

: 526-73-8
1,2,3-trimethylbenzene

Conditions

Conditions	Yield
With pyridine hydrogenfluoride In hexane at 0℃; for 8h;	98%

: 92-52-4
biphenyl

: 98-23-7
1,2,3-trimethyl-5-tert-butylbenzene

A: 526-73-8
1,2,3-trimethylbenzene

B: 1625-92-9
4-tert-butylbiphenyl

Conditions

Conditions	Yield
With Nafion-H at 130 - 135℃; for 12h;	A 80% B n/a

: 98-23-7
1,2,3-trimethyl-5-tert-butylbenzene

A: 526-73-8
1,2,3-trimethylbenzene

B: 1625-92-9
4-tert-butylbiphenyl

Conditions

Conditions	Yield
With biphenyl; Nafion-H at 130 - 135℃; for 12h;	A 80% B n/a

: 13061-96-6
dihydroxy-methyl-borane

: 6781-98-2
2,6-dimethyl-1-chlorobenzene

: 526-73-8
1,2,3-trimethylbenzene

Conditions

Conditions	Yield
With O4P(3-)3K(1+)5H2O; tris(1-adamantyl)phosphine; C28H26N2O8Pd2S2 In tetrahydrofuran at 50℃; for 5h; Suzuki-Miyaura Coupling; Inert atmosphere; Schlenk technique;	50%
With 1,2,3-trimethoxybenzene; O4P(3-)3K(1+)5H2O; tris(1-adamantyl)phosphine; {2-[((acetyl-κO)amino)phenyl-κC](tri-1-adamantylphosphine)palladium}(p-toluenesulfonate) In tetrahydrofuran at 50℃; for 5h; Suzuki-Miyaura Coupling;	50%

: 95-47-6
o-xylene

A: 611-14-3
2-Ethyltoluene

B: 95-63-6
1,2,4-Trimethylbenzene

C: 526-73-8
1,2,3-trimethylbenzene

D: 89-95-2
2-methyl-benzyl alcohol

E: 952-80-7
1,2-bis(2-methylphenyl)ethane

Conditions

Conditions	Yield
With peracetic acid at 20 - 22℃; Product distribution; Irradiation; λ>2900 Angstroem;	A 9.3% B n/a C n/a D 36.9% E n/a

...Expand

: 108-38-3
m-xylene

A: 620-14-4
1-Methyl-3-ethylbenzene

B: 95-63-6
1,2,4-Trimethylbenzene

C: 526-73-8
1,2,3-trimethylbenzene

D: 4662-96-8
1,2-di-m-tolylethane

E: 587-03-1
3-methylbenzyl alcohol

F: 108-67-8
1,3,5-trimethyl-benzene

Conditions

Conditions	Yield
With peracetic acid at 20 - 22℃; Product distribution; Irradiation; λ>2900 Angstroem;	A 7.4% B n/a C n/a D n/a E 30% F n/a

...Expand

: 56-23-5
tetrachloromethane

: 526-73-8
1,2,3-trimethylbenzene

Conditions

Conditions	Yield
With aluminium trichloride at 95℃; Einleiten von Methylchlorid;

: 6783-92-2
1,1,2,3-tetramethylcyclohexane

: 526-73-8
1,2,3-trimethylbenzene

Conditions

Conditions	Yield
at 300℃; Leiten ueber Platin-Aluminiumoxyd;

: 65338-71-8
4,4'-di-tert-butyl-2,2',6,6'-tetramethyldiphenylmethane

: 526-73-8
1,2,3-trimethylbenzene

Conditions

Conditions	Yield
With molybdenum oxide-aluminium oxide; benzene at 450℃;

: 72312-48-2
1,2,3-trimethyl-cyclohexene

: 526-73-8
1,2,3-trimethylbenzene

Conditions

Conditions	Yield
With chromium corundum at 525℃;

1,2,3-Trimethylbenzene Chemical Properties

Molecular Formula: C₉H₁₂
Molecular Weight: 120.19
EINECS: 208-394-8
Melting point: -25 °C(lit.)
Boiling point: 175-176 °C(lit.)
Density: 0.894 g/mL at 25 °C(lit.)
Vapor density: 4.15 (vs air)
Vapor pressure: 3.4 mm Hg ( 37.7 °C)
Refractive index: n20/D 1.513(lit.)
Flash point: 119 °F
Appearance: Colourless liquid
Structure of 1,2,3-Trimethylbenzene (CAS NO.526-73-8):

IUPAC Name: 1,2,3-Trimethylbenzene

1,2,3-Trimethylbenzene Uses

1,2,3-Trimethylbenzene (CAS NO.526-73-8) is mainly used for the preparation of aniline dyes, alkyd resins, polyester resins,etc.

1,2,3-Trimethylbenzene Toxicity Data With Reference

orl-rat LDLo:5000 mg/kg

AMIHAB AMA Archives of Industrial Health. 19 (1959),403.

1,2,3-Trimethylbenzene Consensus Reports

Reported in EPA TSCA Inventory.

1,2,3-Trimethylbenzene Safety Profile

Mildly toxic by ingestion. Flammable liquid when exposed to heat, sparks, or flame. To fight fire, use water spray, mist, dry chemical, CO₂, foam. When heated to decomposition it emits acrid smoke and irritating fumes.
Hazard Codes of 1,2,3-Trimethylbenzene (CAS NO.526-73-8): Irritant Xi
Risk Statements: 10-37
R10:Flammable.
R37:Irritating to respiratory system
Safety Statements: 16
S16:Keep away from sources of ignition.

1,2,3-Trimethylbenzene Standards and Recommendations

OSHA PEL: TWA 25 ppm
ACGIH TLV: TWA 25 ppm
DFG MAK: 20 ppm

1,2,3-Trimethylbenzene Specification

1,2,3-Trimethylbenzene , its cas register number is 526-73-8. It also can be called Hemimellitene ; and Benzene, 1,2,3-trimethyl- .

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