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  • 31543-75-6 Structure
  • Basic information

    1. Product Name: 2,4-DIBROMOTOLUENE
    2. Synonyms: 1,3-Dibromo-4-methylbenzene;2,4-dibromo-1-methyl-benzen;Benzene, 2,4-dibromo-1-methyl-;Benzene,2,4-dibromo-1-methyl-;2,4-DIBROMOTOLUENE;2,4-Dibromo-1-methylbenzene;1-Methyl-2,4-dibromobenzene;NSC 139877
    3. CAS NO:31543-75-6
    4. Molecular Formula: C7H6Br2
    5. Molecular Weight: 249.93
    6. EINECS: 250-689-9
    7. Product Categories: Aromatic Hydrocarbons (substituted) & Derivatives;Halogen toluene;Bromine Compounds
    8. Mol File: 31543-75-6.mol
    9. Article Data: 9
  • Chemical Properties

    1. Melting Point: -10 °C
    2. Boiling Point: 243 °C
    3. Flash Point: 109℃
    4. Appearance: /Liquid
    5. Density: 1.85
    6. Vapor Pressure: 0.0544mmHg at 25°C
    7. Refractive Index: 1.601
    8. Storage Temp.: Sealed in dry,Room Temperature
    9. Solubility: N/A
    10. CAS DataBase Reference: 2,4-DIBROMOTOLUENE(CAS DataBase Reference)
    11. NIST Chemistry Reference: 2,4-DIBROMOTOLUENE(31543-75-6)
    12. EPA Substance Registry System: 2,4-DIBROMOTOLUENE(31543-75-6)
  • Safety Data

    1. Hazard Codes: Xi
    2. Statements: N/A
    3. Safety Statements: N/A
    4. WGK Germany:
    5. RTECS:
    6. TSCA: Yes
    7. HazardClass: N/A
    8. PackingGroup: N/A
    9. Hazardous Substances Data: 31543-75-6(Hazardous Substances Data)

31543-75-6 Usage

Chemical Properties

light yellow liquid

Check Digit Verification of cas no

The CAS Registry Mumber 31543-75-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,1,5,4 and 3 respectively; the second part has 2 digits, 7 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 31543-75:
(7*3)+(6*1)+(5*5)+(4*4)+(3*3)+(2*7)+(1*5)=96
96 % 10 = 6
So 31543-75-6 is a valid CAS Registry Number.
InChI:InChI=1/C7H6Br2/c1-5-2-3-6(8)4-7(5)9/h2-4H,1H3

31543-75-6 Well-known Company Product Price

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  • Alfa Aesar

  • (H63869)  2,4-Dibromotoluene, 98%   

  • 31543-75-6

  • 1g

  • 188.0CNY

  • Detail
  • Alfa Aesar

  • (H63869)  2,4-Dibromotoluene, 98%   

  • 31543-75-6

  • 5g

  • 706.0CNY

  • Detail
  • Alfa Aesar

  • (H63869)  2,4-Dibromotoluene, 98%   

  • 31543-75-6

  • 25g

  • 2822.0CNY

  • Detail

31543-75-6SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 15, 2017

Revision Date: Aug 15, 2017

1.Identification

1.1 GHS Product identifier

Product name 2,4-dibromo-1-methylbenzene

1.2 Other means of identification

Product number -
Other names 2,4-dibromo-1-methyl-benzene

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:31543-75-6 SDS

31543-75-6Synthetic route

3-bromo-4-methylbenzenediazonium tetrafluoroborate

3-bromo-4-methylbenzenediazonium tetrafluoroborate

2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

Conditions
ConditionsYield
With dibenzo-18-crown-6; potassium bromide; copper(ll) bromide; 1,10-Phenanthroline; copper(I) bromide In acetonitrile at 20℃; for 0.333333h; Sandmeyer bromination;97%
3-bromo-4-methylaniline
7745-91-7

3-bromo-4-methylaniline

2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

Conditions
ConditionsYield
Stage #1: 3-bromo-4-methylaniline With hydrogen bromide; sodium nitrite at 0℃;
Stage #2: With hydrogen bromide; copper(I) bromide for 0.666667h; Heating; Further stages.;
90%
toluene
108-88-3

toluene

2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

Conditions
ConditionsYield
With bromine fluoride In ethanol; chloroform at -78℃; for 0.333333h;80%
toluene
108-88-3

toluene

A

para-bromotoluene
106-38-7

para-bromotoluene

B

2-methylphenyl bromide
95-46-5

2-methylphenyl bromide

C

2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

Conditions
ConditionsYield
With N-Bromosuccinimide; iron(III) chloride In acetonitrile for 0.333333h;A 39%
B 48%
C 6%
para-bromotoluene
106-38-7

para-bromotoluene

A

3,4-dibromotoluene
60956-23-2

3,4-dibromotoluene

B

2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

Conditions
ConditionsYield
beim Bromieren;
2-methylphenyl bromide
95-46-5

2-methylphenyl bromide

A

1,4-dibromo-2-methylbenzene
615-59-8

1,4-dibromo-2-methylbenzene

B

2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

Conditions
ConditionsYield
beim Bromieren;
5-bromo-2-methylaniline
39478-78-9

5-bromo-2-methylaniline

2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

2,4-dibromo-5-methylaniline
67643-51-0

2,4-dibromo-5-methylaniline

2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

Conditions
ConditionsYield
With hydrogenchloride; sodium nitrite Behandlung der erhaltenen Diazoniumsalz-Loesung mit wss. H3PO2 unterhalb 5grad;
With sulfuric acid; sodium nitrite Behandlung der erhaltenen Diazoniumsalz-Loesung mit wss. H3PO2 unterhalb 5grad;
para-bromotoluene
106-38-7

para-bromotoluene

bromine
7726-95-6

bromine

iodine
7553-56-2

iodine

A

3,4-dibromotoluene
60956-23-2

3,4-dibromotoluene

B

2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

para-bromotoluene
106-38-7

para-bromotoluene

amalgamated aluminium

amalgamated aluminium

A

3,4-dibromotoluene
60956-23-2

3,4-dibromotoluene

B

2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

C

2,4,5-tribromotoluene
3278-88-4

2,4,5-tribromotoluene

Conditions
ConditionsYield
beim Bromieren;
2.4-dibromo-3-amino-toluene

2.4-dibromo-3-amino-toluene

2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

Conditions
ConditionsYield
With ethanol; nitrogen oxides
2-methylphenyl bromide
95-46-5

2-methylphenyl bromide

bromine
7726-95-6

bromine

iodine
7553-56-2

iodine

A

1,4-dibromo-2-methylbenzene
615-59-8

1,4-dibromo-2-methylbenzene

B

2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

2-methylphenyl bromide
95-46-5

2-methylphenyl bromide

bromine
7726-95-6

bromine

amalgamated aluminium

amalgamated aluminium

A

1,4-dibromo-2-methylbenzene
615-59-8

1,4-dibromo-2-methylbenzene

B

2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

ethanol
64-17-5

ethanol

2,4-dibromo-5-methylaniline
67643-51-0

2,4-dibromo-5-methylaniline

nitrogen oxides

nitrogen oxides

2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

Conditions
ConditionsYield
nachfolgendes Kochen;
Ni(mes)(o-tol)(PMe2Ph)2

Ni(mes)(o-tol)(PMe2Ph)2

A

2,4,6-trimethylphenyl bromide
576-83-0

2,4,6-trimethylphenyl bromide

B

2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

C

2,2',4,6-tetramethylbiphenyl
89970-02-5

2,2',4,6-tetramethylbiphenyl

D

3-bromo-2,2',4,6-tetramethyl-1,1'-biphenyl

3-bromo-2,2',4,6-tetramethyl-1,1'-biphenyl

Conditions
ConditionsYield
With bromine In diethyl ether for 0.5h; Ambient temperature; Yield given. Further byproducts given;
2-bromo-4-nitrotoluene
7745-93-9

2-bromo-4-nitrotoluene

2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

Conditions
ConditionsYield
Multi-step reaction with 2 steps
1.1: SnBr2
2.1: NaNO2
2.2: CuBr
View Scheme
Phenetole
103-73-1

Phenetole

A

para-bromotoluene
106-38-7

para-bromotoluene

B

2-methylphenyl bromide
95-46-5

2-methylphenyl bromide

C

2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

D

benzyl bromide
100-39-0

benzyl bromide

Conditions
ConditionsYield
With hydrogenchloride; dihydrogen peroxide; hexaammonium heptamolybdate tetrahydrate In water at 20 - 25℃; for 22h;
toluene
108-88-3

toluene

A

3,3'-dimethyl-biphenyl
612-75-9

3,3'-dimethyl-biphenyl

B

2-Bromo-5-fluorotoluene
452-63-1

2-Bromo-5-fluorotoluene

C

2-methylphenyl bromide
95-46-5

2-methylphenyl bromide

D

2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

Conditions
ConditionsYield
With 2BrF4H(1-)*Ba(2+) In 1,1,2-Trichloro-1,2,2-trifluoroethane at 45℃; for 5h;A 17 %Chromat.
B 9 %Chromat.
C 14 %Chromat.
D 24 %Chromat.
2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

2,4-dibromo-1-(bromomethyl)benzene
64382-92-9

2,4-dibromo-1-(bromomethyl)benzene

Conditions
ConditionsYield
With N-Bromosuccinimide; 2,2'-azobis(isobutyronitrile) In tetrachloromethane for 1h; Heating;85%
beim Bromieren;
durch Bromieren;
carbon dioxide
124-38-9

carbon dioxide

2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

4-methyl isophthalic acid
3347-99-7

4-methyl isophthalic acid

Conditions
ConditionsYield
Stage #1: carbon dioxide With o-phenylenebis(diphenylphosphine); copper(II) acetate monohydrate In 1,4-dioxane at 65℃; for 0.416667h; Schlenk technique;
Stage #2: 2,4-dibromotoluene With palladium diacetate; triethylamine; 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene In 1,4-dioxane; toluene at 100℃; for 16h; Schlenk technique;
62%
NH-pyrazole
288-13-1

NH-pyrazole

2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

1-(3-bromo-4-methylphenyl)pyrazole

1-(3-bromo-4-methylphenyl)pyrazole

Conditions
ConditionsYield
With copper(l) iodide; L-valine; potassium carbonate In dimethyl sulfoxide at 120℃; for 24h; Inert atmosphere; Sealed tube;53%
2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

(diphenylmethylsilyl)dimesitylborane
440361-72-8

(diphenylmethylsilyl)dimesitylborane

A

(3-bromo-4-methylphenyl)dimesitylborane

(3-bromo-4-methylphenyl)dimesitylborane

B

C20H19BrSi

C20H19BrSi

Conditions
ConditionsYield
Stage #1: (diphenylmethylsilyl)dimesitylborane With sodium t-butanolate In 1,4-dioxane; hexane at 50℃; for 0.0833333h; Inert atmosphere;
Stage #2: 2,4-dibromotoluene In 1,4-dioxane; hexane at 50℃; for 24h; Inert atmosphere;
A 29%
B n/a
2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

para-bromotoluene
106-38-7

para-bromotoluene

Conditions
ConditionsYield
With diethyl ether; magnesium Behandlung der gebildeten Grignard-Verbindung mit Wasser;
2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

2,4,5-tribromotoluene
3278-88-4

2,4,5-tribromotoluene

Conditions
ConditionsYield
With aluminium amalgam beim Bromieren;
2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

2,4-dibromobenzoic acid
611-00-7

2,4-dibromobenzoic acid

Conditions
ConditionsYield
With nitric acid
2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

1,5-dibromo-2-methyl-4-nitrobenzene
860753-33-9

1,5-dibromo-2-methyl-4-nitrobenzene

Conditions
ConditionsYield
With nitric acid
2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

2,4-dibromo-3,5-dinitro-toluene
857001-30-0

2,4-dibromo-3,5-dinitro-toluene

Conditions
ConditionsYield
With sulfuric acid; nitric acid
2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

copper(II) cyanide

copper(II) cyanide

2,4-dicyanotoluene
1943-88-0

2,4-dicyanotoluene

diethyl ether
60-29-7

diethyl ether

2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

magnesium

magnesium

para-bromotoluene
106-38-7

para-bromotoluene

Conditions
ConditionsYield
Behandlung mit Eis und wss. HCl;
tetrachloromethane
56-23-5

tetrachloromethane

2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

bromine
7726-95-6

bromine

amalgamated aluminium

amalgamated aluminium

A

2,4,5-tribromotoluene
3278-88-4

2,4,5-tribromotoluene

B

2,4,6-tribromotoluene
6320-40-7

2,4,6-tribromotoluene

diethyl ether
60-29-7

diethyl ether

2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

magnesium

magnesium

5-bromo-2-methylbenzoic acid
79669-49-1

5-bromo-2-methylbenzoic acid

Conditions
ConditionsYield
Behandlung mit CO2;
2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

nitric acid
7697-37-2

nitric acid

2,4-dibromobenzoic acid
611-00-7

2,4-dibromobenzoic acid

2,4-dibromotoluene
31543-75-6

2,4-dibromotoluene

nitric acid
7697-37-2

nitric acid

A

1,5-dibromo-2-methyl-4-nitrobenzene
860753-33-9

1,5-dibromo-2-methyl-4-nitrobenzene

B

2,4-dibromo-3,5-dinitro-toluene
857001-30-0

2,4-dibromo-3,5-dinitro-toluene

31543-75-6Relevant articles and documents

The first syntheses of 3-bromofascaplysin, 10-bromofascaplysin and 3,10-dibromofascaplysin-marine alkaloids from Fascaplysinopsis reticulata and Didemnum sp. by application of a simple and effective approach to the pyrido[1,2-a:3,4-b′]diindole system

Zhidkov, Maxim E.,Baranova, Olga V.,Balaneva, Nadezhda N.,Fedorov, Sergey N.,Radchenko, Oleg S.,Dubovitskii, Sergey V.

, p. 7998 - 8000 (2007)

A simple and practical approach for the synthesis of the marine sponge pigment fascaplysin was used for the total syntheses of its natural derivatives, the marine alkaloids 3-bromofascaplysin, 10-bromofascaplysin, and 3,10-dibromofascaplysin. The conditions of each step were revised, and as a result these compounds were produced by identical procedures with total yields of 40-43%.

Reactivity of alkali and alkaline earth metal tetrafluorobromates towards aromatic compounds and pyridine

Sobolev, Vasily I.,Filimonov, Victor D.,Ostvald, Roman V.,Radchenko, Vyacheslav B.,Zherin, Ivan I.

, p. 120 - 123 (2016/11/17)

The bromination activity of tetrafluorobromates of alkali and alkali-earth metals increases in the order KBrF4, CsBrF4, RbBrF4and Ba(BrF4)2. The most active tetrafluorobromate—Ba(BrF4)2is able to selectively brominate the deactivated aromatic compounds nitrobenzene and 4-nitrotoluene, but not the activated compounds benzene and toluene. In all cases bromination of methyl groups of methylbenzenes does not occur. Ba(BrF4)2forms the known complex C6H5N·BrF3when reacted with pyridine. Due to dilution by inert BaF2, this pyridine-based complex is air stable and can be considered as safer and more convenient reagent in comparison with the original fluorobromates; it can selectively brominate benzene and toluene in contrast with tetrafluorobromates.

PROCESS FOR THE PREPARATION OF 4-BROMOPHENYL DERIVATIVES

-

Page/Page column 10-11, (2010/04/03)

Disclosed is a process for the preparation of a mixture of 4-bromophenyl derivatives (compound of formula (2)) and 2,4-dibromophenyl derivatives (compound of formula (3)) comprising the steps of [1] reacting in a two-phase (liquid-liquid) system a bromide containing source with a phenyl derivative (formula (1)) in the presence of an excess of an oxidizing agent, an acid, and optionally a catalyst selected from vanadium pentoxide and ammonium heptamolybdate forming 4-bromo- (compound of formula (2)) and 2,4-dibromo derivatives (compound of formula (3)) and as intermediate product the 2-bromo derivative (compound of formula (4)) which reacts in step [2] to the 2,4-dibromo derivative (formula (3)) according to the following reaction scheme 2 wherein R1 is hydroxy; C1-C5alkoxy; or -NR2R3; and R2 and R3 independently from each other are hydrogen; or C1-C5alkyl.

Catalytic Sandmeyer bromination

Beletskaya, Irina P.,Sigeev, Alexander S.,Peregudov, Alexander S.,Petrovskii, Pavel V.

, p. 2534 - 2538 (2008/03/13)

An efficient catalyst system for Sandmeyer bromination is proposed. Aryl bromides and dibromides can be obtained with excellent yield by this synthetic protocol. Georg Thieme Verlag Stuttgart.

Halogenation of Aromatic Compounds by N-chloro-, N-bromo-, and N-iodosuccinimide

Tanemura, Kiyoshi,Suzuki, Tsuneo,Nishida, Yoko,Satsumabayashi, Koko,Horaguchi, Takaaki

, p. 932 - 933 (2007/10/03)

An efficient and mild method for the halogenation of aromatic compounds using N-chloro-, N-bromo-, and N-iodosuccinimide in the presence of NH 4NO3 or FeCl3 in acetonitrile was developed.

Synthesis, absorption and luminescence of a new series of soluble distyrylbenzenes featuring cyano substituents at the peripheral rings

Schweikart, Karl-Heinz,Hanack, Michael,Lueer, Larry,Oelkrug, Dieter

, p. 293 - 302 (2007/10/03)

The synthesis of a complete series of nine soluble distyrylbenzenes (DSBs) with two (2a-c) and four cyano groups (1a-f) attached to the peripheral aromatic rings is reported. They were prepared by the Wittig reaction and characterized by 1H and 13C NMR, FT-IR, UV/Vis, PL, EL, mass spectra, and elemental analysis. The optical properties have been studied in detail to monitor structure-luminescence relationships as a function of the position of the cyano moieties. The DSBs with cyano substituents show bathochromic shifts in their absorption spectra when compared to the parent DSB (30). The extent of this red-shift depends on electronic and steric factors. The bis(p-cyano)-substituted compound 2c exhibits a small Stokes shift and a remarkably high quantum yield of ψF = 0.6-0.8 in the solid state. All the new distyrylbenzenes show electroluminescence when employed in devices with an ITO/PcCu/DSB/Al configuration and with colors ranging from red to green.

DECOMPOSITION OF (NiRR'L2) COMPLEXES INDUCED BY BROMINE OR ANODIC OXIDATION

Coronas, Juan M.,Muller, Guillermo,Rocamora, Mercedes

, p. 227 - 236 (2007/10/02)

A study has been made of the decomposition of the compounds t-(NiRR'L2) (L=PMe2Ph and PEt3; R=aryl or vinyl groups) and (Ni(mes)(o-tol)bipy) (mes=mesityl) oxidatively induced either by electrochemical means or by bromine.No organometallic compound of Ni(III) was isolated in the above reactions, but a pentacoordinate intermediate of Ni(III) is postulated.Breakdown takes place readily after the Ni(III) intermediate is formed.If the decomposition is induced is induced electrochemically, the intermediate decomposes giving only the coupling product R-R'.When bromine is used as the oxidizing agent, the Ni(III) intermediate is only formed if coordination to the central atom is allowed by the volume of the ligands.Thus, (Ni(C2Cl3)(mes)(PMe2Ph)2) dos not decompose at all, and only (Ni(C2Cl3(mesBr2)(PMe2Ph)2) is obtained.The intermediate ' Ni(III)RR'BrL2' undergoes reductive elimination to give R-R', RBr and R'Br.The formation of the products R-R'is increasingly favoured the greater the electronegativity of the organic ligands.The reductive elimination giving RBr takes place more readily the greater the electronegativity of the organic ligand R.The product of the reductive elimination reaction is 'Ni(I)Br', 'Ni(I)R', or 'Ni(I)R'', which in the presence of bromine give Ni(2+), (NiBr(RBr)L2), phosphonium salts, RBr, and R'Br.

Process for the preparation of bromoarylacetylene and aryldiacetylene precursors

-

, (2008/06/13)

Bromoarylacetylenes such as m-bromophenylacetylene and certain precursors to such bromoarylacetylene are prepared by reacting an aryldibromide with a substituted terminal acetylene compound containing at least three carbon atoms and a hydroxy group on the carbon atom adjacent to the acetylene group in the presence of a dialkyl or trialkyl amine solvent and a catalyst system consisting of a palladium complex containing two halogen moieties and two tri-substituted phosphine moieties. Additional triphenylphosphine can be added. A cuprous iodide promoter is also employed in the reaction sequence. The bromoarylacetylenes can be reacted with a substituted terminal acetylene compound as defined using the same catalyst system as defined to produce the corresponding aryldihydroxy substituted acetylenes. Certain bromophenylhydroxy substituted acetylenes are claimed as new compositions.

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