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Basic Information
CAS No.: 74-95-3
Name: Dibromo methane
Molecular Structure:
Molecular Structure of 74-95-3 (Dibromo methane)
Formula: CH2Br2
Molecular Weight: 173.835
Synonyms: Methylene bromide;Methylene dibromide;NSC 7293;Dibromomethane [UN2664] [Poison];Methane, dibromo-;
EINECS: 200-824-2
Density: 2.434 g/cm3
Melting Point: -52 °C
Boiling Point: 97 °C at 760 mmHg
Flash Point: 96-98 °C
Solubility: water: 0.1 g/100 mL (20 °C)
Appearance: colourless liquid
Hazard Symbols: HarmfulXn,ToxicT,FlammableF
Risk Codes: 20-52/53-39/23/24/25-23/24/25-11
Safety: 24-61-45-36/37-16-7
Transport Information: UN 2664 6.1/PG 3
PSA: 0.00000
LogP: 1.73370
Related products
Synthetic route
75-25-2

Bromoform

2857-97-8

trimethylsilyl bromide

A

18142-75-1

trimethyl-tribromomethyl-silane

B

74-95-3

1,2-dibromomethane

Conditions
ConditionsYield
With hexaethylphosphoric triamide In diethyl ether at 20℃; for 1h;A 82%
B n/a
...Expand
6317-18-6

bis(thiocyanato)methane

540-72-7

sodium thiocyanide

74-95-3

1,2-dibromomethane

Conditions
ConditionsYield
Stage #1: bis(thiocyanato)methane; sodium thiocyanide In methanol; water at 74 - 75℃; for 5h;
Stage #2: With sodium hydrogencarbonate In methanol; water pH=6.3; Concentration; Solvent;		79.3%
34557-54-5

methane

A

74-83-9

methyl bromide

B

74-95-3

1,2-dibromomethane

Conditions
ConditionsYield
With bromine at 18 - 500℃; for 0.0166667h; Gas phase;A 70.6%
B 24.7%
With hydrogen bromide; oxygen; Mg/Ru/SiO2 In water at 580℃; Conversion of starting material;
With hydrogen bromide; oxygen; Ba/Bi/Ru/SiO2 In water at 580 - 600℃; Conversion of starting material;
75-09-2

dichloromethane

A

74-97-5

chlorobromomethane

B

74-95-3

1,2-dibromomethane

Conditions
ConditionsYield
With calcium bromide; tetrahexylammonium bromide at 110℃; for 24h;A 30%
B 62%
With ethyl bromide; aluminum oxide; tetrabutyl phosphonium bromide at 170℃;A 49 % Spectr.
B 25 % Spectr.
With ethyl bromide at 170℃; Product distribution; var. of catalyst, reagent;A 50 % Spectr.
B 24 % Spectr.
With ethyl bromide; aluminum oxide at 170℃;A 66 % Spectr.
B 14 % Spectr.
76508-46-8

2-ethoxy-1,3-dioxane

75-25-2

Bromoform

A

2453-03-4

trimethylene carbonate

B

74-96-4

ethyl bromide

C

53452-10-1

3-Brompropylformiat

D

75-07-0

acetaldehyde

E

3-bromopropyl ethyl carbonate

F

74-95-3

1,2-dibromomethane

Conditions
ConditionsYield
dibenzoyl peroxide at 100℃; for 2h; Rate constant; Product distribution; other temperature;A n/a
B n/a
C n/a
D n/a
E 60%
F n/a
...Expand
75-25-2

Bromoform

83498-70-8

2-(hexyloxy)-1,3-dioxolane

A

96-49-1

[1,3]-dioxolan-2-one

B

111-25-1

1-bromo-hexane

C

6065-67-4

formic acid-(2-bromo-ethyl ester)

D

66-25-1

hexanal

E

2-bromoethyl hexyl carbonate

F

74-95-3

1,2-dibromomethane

Conditions
ConditionsYield
dibenzoyl peroxide at 100℃; for 2h; Rate constant; Product distribution; other temperature;A n/a
B n/a
C n/a
D n/a
E 60%
F n/a
...Expand
75-77-4

chloro-trimethyl-silane

75-25-2

Bromoform

A

18142-75-1

trimethyl-tribromomethyl-silane

B

74-95-3

1,2-dibromomethane

Conditions
ConditionsYield
With hexaethylphosphoric triamide In diethyl ether at 20℃; for 1h;A 56%
B n/a
...Expand
75-25-2

Bromoform

2-(hexyloxy)-m-dioxane

A

2453-03-4

trimethylene carbonate

B

111-25-1

1-bromo-hexane

C

53452-10-1

3-Brompropylformiat

D

66-25-1

hexanal

E

3-bromopropyl hexyl carbonate

F

74-95-3

1,2-dibromomethane

Conditions
ConditionsYield
dibenzoyl peroxide at 100℃; for 2h; Rate constant; Product distribution; other temperature;A n/a
B n/a
C n/a
D n/a
E 56%
F n/a
...Expand
34557-54-5

methane

A

74-83-9

methyl bromide

B

75-25-2

Bromoform

C

558-13-4

carbon tetrabromide

D

74-95-3

1,2-dibromomethane

Conditions
ConditionsYield
With bromine at 500℃; Product distribution; Further Variations:; Temperatures; Bromination;A 17.4%
B 0.48%
C 2.5%
D 5%
...Expand
74-83-9

methyl bromide

74-95-3

1,2-dibromomethane

Conditions
ConditionsYield
With bromine at 250℃;
Raw Materials
75-77-4
925-90-6
75-09-2
74-83-9
108-90-7
74-96-4
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Chemistry


IUPAC Name: Dibromomethane 
Empirical Formula: CH2Br2
Molecular Weight: 173.8346
Canonical SMILES: C(Br)Br
InChI: InChI=1S/CH2Br2/c2-1-3/h1H2
InChIKey: FJBFPHVGVWTDIP-UHFFFAOYSA-N
EINECS: 200-824-2
Product Categories: Pharmaceutical Intermediates; Organics; alpha,omega-Bifunctional Alkanes; alpha,omega-Dibromoalkanes; Monofunctional & alpha,omega-Bifunctional Alkanes; Analytical Chemistry; Standard Solution of Volatile Organic Compounds for Water & Soil Analysis; Standard Solutions (VOC); Alpha Sort; BromoVolatiles/ Semivolatiles; Chemical Class; D; DAlphabetic; DIA - DIC; Halogenated 
storage temp.: Refrigerator
Water Solubility: 0.1 g/100 mL (20 ºC) 
Stability: Stable. Incompatible with strong oxidizing agents, aluminium, magnesium. Reacts violently with potassium. 
Index of Refraction: 1.532
Molar Refractivity: 22.14 cm3
Molar Volume: 71.4 cm3
Surface Tension: 37 dyne/cm
Density: 2.434 g/cm3
Flash Point: 96-98 °C
Enthalpy of Vaporization: 32.92 kJ/mol
Boiling Point: 97 °C at 760 mmHg
Vapour Pressure: 48.7 mmHg at 25 °C
Appearance: colourless liquid
Melting Point: -52 °C
Classification Code of Dibromomethane (CAS NO.74-95-3): Mutagens; Mutation data; Noxae; TSCA Flag T [Subject to the Section 4 test rule under TSCA]

Uses

 Dibromomethane (CAS NO.74-95-3) is used as a solvent, gage fluid and in organic synthesis.

Toxicity Data With Reference

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
mouse LD50 subcutaneous 3738mg/kg (3738mg/kg)   Toxicology and Applied Pharmacology. Vol. 4, Pg. 354, 1962.
rabbit LD50 oral 1gm/kg (1000mg/kg)   Dow Chemical Company Reports. Vol. MSD-472,
rabbit LD50 skin > 4gm/kg (4000mg/kg)   Dow Chemical Company Reports. Vol. MSD-472,
rabbit LDLo rectal 5gm/kg (5000mg/kg) BEHAVIORAL: CONVULSIONS OR EFFECT ON SEIZURE THRESHOLD

GASTROINTESTINAL: CHANGES IN STRUCTURE OR FUNCTION OF SALIVARY GLANDS

LUNGS, THORAX, OR RESPIRATION: RESPIRATORY STIMULATION		 Journal of Pharmacology and Experimental Therapeutics. Vol. 34, Pg. 223, 1928.
rat LC50 inhalation 40gm/m3/2H (40000mg/m3)   "Toxicometric Parameters of Industrial Toxic Chemicals Under Single Exposure," Izmerov, N.F., et al., Moscow, Centre of International Projects, GKNT, 1982Vol. -, Pg. 83, 1982.
rat LD50 oral 108mg/kg (108mg/kg)   National Technical Information Service. Vol. PB85-143766

Consensus Reports

Community Right-To-Know List. Reported in EPA TSCA Inventory.

Safety Profile

Hazard Codes:  HarmfulXn,ToxicT,FlammableF
Risk Statements:  20-52/53-39/23/24/25-23/24/25-11 
R20:Harmful by inhalation. 
R52/53:Harmful to aquatic organisms, may cause long-term adverse effects in the aquatic environment. 
R39:Danger of very serious irreversible effects. 
R23/24/25:Toxic by inhalation, in contact with skin and if swallowed. 
R11:Highly flammable.
Safety Statements:  24-61-45-36/37-16-7 
S24:Avoid contact with skin. 
S61:Avoid release to the environment. Refer to special instructions / safety data sheets. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S36/37:Wear suitable protective clothing and gloves. 
S16:Keep away from sources of ignition. 
S7:Keep container tightly closed.
RIDADR:UN 2664 6.1/PG 3
WGK Germany:  2
RTECS:  PA7350000
HazardClass:  6.1
PackingGroup:  III
A poison. Moderately toxic by subcutaneous route. Mildly toxic by inhalation. Mutation data reported. Mixtures with potassium explode on light impact. When heated to decomposition it emits toxic fumes of Br−.

Standards and Recommendations

DOT Classification:  6.1; Label: KEEP AWAY FROM FOOD

Specification

  Dibromomethane (CAS NO.74-95-3), its Synonyms are Methylene bromide ; Methane, dibromo- ; Methylene bromide ; Methylene dibromide .