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1,2,3,4-Tetramethylbenzene

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Name

1,2,3,4-Tetramethylbenzene

EINECS 207-673-1
CAS No. 488-23-3 Density 0.838 g/mL at 25 °C(lit.)
PSA 0.00000 LogP 2.92020
Solubility Immiscible with water. Melting Point 76-80 °C(lit.)
Formula C10H14 Boiling Point 204 °C at 760 mmHg
Molecular Weight 134.221 Flash Point 69.7 °C
Transport Information UN 1325 4 Appearance N/A
Safety S26-S37 Risk Codes R11
Molecular Structure Molecular Structure of 488-23-3 (1,2,3,4-Tetramethylbenzene) Hazard Symbols FlammableF
Synonyms

1,2,3,4-Tetramethylbenzene;NSC 93932; Prehnitene; Prehnitol

Article Data 88

1,2,3,4-Tetramethylbenzene Synthetic route

38108-82-6

1,2-bis(bromomethyl)-3,6-dimethylbenzene

488-23-3

1,2,3,4-Tetramethylbenzene

Conditions
ConditionsYield
With lithium aluminium tetrahydride In tetrahydrofuran at 0 - 5℃; Temperature; Reagent/catalyst; Inert atmosphere; Reflux;97.3%
With tetrahydrofuran; lithium aluminium tetrahydride
95-93-2

1,2,4,5-tetramethylbenzene

75-36-5

acetyl chloride

A

488-23-3

1,2,3,4-Tetramethylbenzene

B

527-53-7

1,2,3,5-Tetramethylbenzene

C

2142-79-2

2,3,5,6-tetramethylacetophenone

Conditions
ConditionsYield
With aluminium trichloride In tetrachloromethane 1.) 5 deg C, 1 h; 2.) 25 deg C, 1 h;A 2.3%
B 0.1%
C 94.6%
527-53-7

1,2,3,5-Tetramethylbenzene

108-24-7

acetic anhydride

A

95-93-2

1,2,4,5-tetramethylbenzene

B

488-23-3

1,2,3,4-Tetramethylbenzene

C

2142-78-1

1-(2,3,4,6-tetramethyl-phenyl)-ethanone

D

2142-79-2

2,3,5,6-tetramethylacetophenone

Conditions
ConditionsYield
With aluminium trichloride In carbon disulfide at 50℃; for 0.5h; Further byproducts given;A 1.8%
B 1.9%
C 92.8%
D 2.2%
95-93-2

1,2,4,5-tetramethylbenzene

108-24-7

acetic anhydride

A

488-23-3

1,2,3,4-Tetramethylbenzene

B

2142-79-2

2,3,5,6-tetramethylacetophenone

C

15517-58-5

1,1′-(2,3,5,6-tetramethyl-1,4-phenylene)bis(ethan-1-one)

Conditions
ConditionsYield
aluminium trichloride In carbon disulfide 1.) 25 deg C, 1 h; 2.) 50 deg C, 3 h;A 2.9%
B 69.6%
C 27.5%
503-17-3

dimethylacetylene

Cp2TiCl2

Cp2TiCl2

488-23-3

1,2,3,4-Tetramethylbenzene

Conditions
ConditionsYield
Stage #1: Cp2TiCl2 With n-butyllithium In tetrahydrofuran; hexane at -78℃; for 1h;
Stage #2: dimethylacetylene In tetrahydrofuran; hexane at -10℃; for 3h;
Stage #3: With propyl cyanide In tetrahydrofuran; hexane at 50℃; for 1h;
53%
18611-39-7

1,2-Diisopropyliden-3,4-dichlor-cyclobutan

A

488-23-3

1,2,3,4-Tetramethylbenzene

B

1124-20-5

2-(3-methylphenyl)propene

C

76886-19-6

1-chloro-2-isopropyl-6-methylbenzene

Conditions
ConditionsYield
at 250℃; for 2.5h;A 51%
B 11%
C 30%
18611-37-5

4-Chlor-2-chlormethylen-3-isopropyliden-1,1-dimethyl-cyclobutan

A

488-23-3

1,2,3,4-Tetramethylbenzene

B

18611-39-7

1,2-Diisopropyliden-3,4-dichlor-cyclobutan

C

76886-19-6

1-chloro-2-isopropyl-6-methylbenzene

Conditions
ConditionsYield
at 300℃; for 2.5h; Mechanism; pyrolysis of halogen derivatives of dimethylenecyclobutane and methylenecyclobutene investigated;A 48%
B n/a
C 2%
18611-37-5

4-Chlor-2-chlormethylen-3-isopropyliden-1,1-dimethyl-cyclobutan

A

488-23-3

1,2,3,4-Tetramethylbenzene

B

1124-20-5

2-(3-methylphenyl)propene

C

76886-19-6

1-chloro-2-isopropyl-6-methylbenzene

Conditions
ConditionsYield
at 300℃; for 2.5h;A 48%
B 28%
C 2%
115-10-6

Dimethyl ether

106-42-3

para-xylene

A

488-23-3

1,2,3,4-Tetramethylbenzene

B

700-12-9

pentamethylbenzene,

C

87-85-4

Hexamethylbenzene

Conditions
ConditionsYield
at 450℃; Leiten ueber Aluminiumoxyd-Siliciumdioxyd-Kontakte;
95-93-2

1,2,4,5-tetramethylbenzene

527-53-7

1,2,3,5-Tetramethylbenzene

488-23-3

1,2,3,4-Tetramethylbenzene

Conditions
ConditionsYield
With sulfuric acid at 85℃; Erhitzen der gebildeten 1.2.3.4-Tetramethyl-benzol-sulfonsaeure-(5) mit wss. H2SO4 auf 145grad;

1,2,3,4-Tetramethylbenzene Chemical Properties

Molecular Formula of 1,2,3,4-Tetramethylbenzene (CAS NO.488-23-3): C10H14
Molecular Weight: 134.22 g/mol
EINECS: 202-465-7
Flashing point: 69.7 °C
Index of Refraction: 1.5190
Density: 0.838 g/mL at 25 °C(lit.)
Boiling Point: 0.838 g/mL at 25 °C(lit.)
Melting point: 76-80 °C(lit.)
Structure of 1,2,3,4-Tetramethylbenzene (CAS NO.488-23-3):
                   
IUPAC Name: 1,2,3,4-Tetramethylbenzene

1,2,3,4-Tetramethylbenzene Toxicity Data With Reference

1.    

skn-rbt 100 mg/24H MLD

    DCTODJ    Drug and Chemical Toxicology. 1 (1978),219.
2.    

orl-rat LD50:6408 mg/kg

    DCTODJ    Drug and Chemical Toxicology. 1 (1978),219.

1,2,3,4-Tetramethylbenzene Consensus Reports

Reported in EPA TSCA Inventory.

1,2,3,4-Tetramethylbenzene Safety Profile

Mildly toxic by ingestion. A skin irritant. A flammable material. When heated to decomposition it emits acrid smoke and irritating fumes.
Hazard Codes of 1,2,3,4-Tetramethylbenzene (CAS NO.488-23-3): F
Risk Statements:  
R11:Highly flammable.
Safety Statements:  
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.  
S37:Wear suitable gloves. 
RIDADR  UN 1325 4.1/PG 2
WGK Germany  1
RTECS  DC0500000

1,2,3,4-Tetramethylbenzene Specification

 1,2,3,4-Tetramethylbenzene , its cas register number is 488-23-3. It also can be called Prehnitene ; and Benzene, 1,2,3,4-tetramethyl- .

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