Acetyl bromide

  • Ethanoyl bromide
Formula
CH3COBr
Structure
Description
A colorless fuming liquid with a pungent odor.
Uses
Organic synthesis, dye manufacture.

Registry Numbers and Inventories.
CAS
506-96-7
EC (EINECS/ELINCS)
208-061-7
EC Class
corrosive
R 14 34 36/37
S 26 36/37/39 45
RTECS
AO5955000
RTECS class
Other
UN (DOT)
1716
Merck
13,84
Beilstein/Gmelin
1697546
Beilstein Reference
4-02-00-00398
Swiss Giftliste 1
G-1040
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed

Properties.
Formula
C2H3BrO
Formula mass
122.95
Melting point, °C
-96
Boiling point, °C
77
Vapor pressure, mmHg
122
Vapor density (air=1)
4.2
Odor Threshold Odor threshold is 5.00X10-4 mg/L
Density
1.6625 g/cm3 (16 C)
Solubility in water
Reacts
Refractive index
1.45017 (15.8 C)
Heat of vaporization
30.37 kJ/mol

Hazards and Protection.
Storage
Protect from water.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Safety goggles; gloves; adequate ventilation; provisions for flushing eyes or skin with water.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Keep sparks, flames, and other sources of ignition away. Keep material out of water sources and sewers. Build dikes to contain flow as necessary. Use water spray to knock-down vapors. Do not use water on material itself. Neutralize spilled material with crushed limestone, soda ash, or lime. Vapor knockdown water is corrosive or toxic and should be diked for containment. Land spill: Dig a pit, pond, lagoon, holding area to contain liquid or solid material. Dike surface flow using soil, sand bags, foamed polyurethane, or foamed concrete. Absorb bulk liquid with fly ash or cement powder. Water spill: If dissolved, in region of 10 ppm or greater concentration, apply activated carbon at ten times the spilled amount. Adjust pH to neutral (pH=7). Use mechanical dredges or lifts to remove immobilized masses of pollutants and precipitates.
Disposal code
11
Stability
Decomposes violently on contact with moisture. Highly reactive. Hydrolyzes readily. Decomposition products are corrosive and toxic fumes of carbonyl bromide and bromine.
Incompatibilities
React vigorously with bases, both organic and inorganic Incompatible with oxidizing agents and alcohols May react vigorously or explosively
Decomposition
When heated to decomposition, it emits highly corrosive and toxic fumes of carbonyl bromide and bromine. Decomposed by water to acetic and hydrobromic acids with release of heat.

Fire.
Flash Point,°C
71
Fire fighting
Use dry chemical or carbon dioxide. Do not use water on material itself. If large quantities of combustibles are involved, use water in flooding quantities as spray and fog. Use water spray to knock-down vapors. Cool all affected containers with flooding quantities of water. Apply water from as far a distance as possible.
Fire potential
Very flammable. Combustion probable.
Hazards
Flashback along vapor trail may occur.
Combustion products
Toxic and irritating hydrogen bromide fumes may form in fires.
Health
3
 
Flammability
3
 
 
Reactivity
2
 

Health.
Poison_Class
2
Exposure effects
Abnormally low blood pressure may occur after ingestion with corrosive injury and hemorrhage from the gastrointestinal tract. Abnormal neuropsychologic function has been reported following hydrochloric acid exposure from a leaking tanker truck.
   Ingestion
Ingestion of acids may result in burns, gastrointestinal bleeding, gastritis, perforations, dilation, edema, necrosis, vomiting, stenosis, fistula, and duodenal/jejunal injury.
   Inhalation
Inhalation may produce dyspnea, pleuritic chest pain, upper airway edema, pulmonary edema, hypoxemia, bronchospasm, pneumonitis, and persistent pulmonary function abnormalities. Airway hyperreactivity has also been reported.
   Skin
See Inhalation.
   Eyes
Tearing, epistaxis, photophobia, blepharospasm, and brown discoloration of mucous membranes and the tongue may be noted.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Remove victim from exposure; if breathing has stopped, give artificial respiration; if breathing is difficult, give oxygen; watch for delayed lung damage.
   Skin
Flush with soap and water; treat burns as needed.
   Eyes
Flush with water for at least 15 min.; get medical attention.

Transport.
UN number
1716
Response guide
Hazard class
8
PRTC
T
Packing Group
II
 
USCG CHRIS Code
ABM
 
HS Code
2915 90 80
 
Std. Transport #
4931705