Methyl aluminum sesquibromide

  • Tribromotrimethyldialuminum
Formula
C3H9Al2Br3
Structure
Description
Cloudy yellow liquid @ 25 deg c.
Uses
Catalyst for polymerization of olefins & hydrogenation of aromatics, chemical intermediate.

Registry Numbers and Inventories.
CAS
12263-85-3
EC (EINECS/ELINCS)
235-532-4
RTECS
BD1810000
RTECS class
Other
UN (DOT)
3052
Beilstein/Gmelin
171593 (G)
Swiss Giftliste 1
G-7369
Canada DSL/NDSL
NDSL
US TSCA
Listed

Properties.
Formula
C3H9Al2Br3
Formula mass
338.81
Boiling point, °C
166
Density
1.514 g/cm3 (25 C)

Hazards and Protection.
Storage
Keep out of contact with air and moisture separate from air, water, halocarbons, alcohols, store in a cool, dry, well-ventilated location. Outside or detached storage is preferred. Inside storage should be in a standard flammable liquids storage warehouse, room, or cabinet. Aluminum alkyls aluminum alkyls. In undiluted condition. Must be kept under inert gas like nitrogen or argon, and all possibility of contact with water must be avoided. Solution containing not more than 20% of these compd in non-reactive solvents, however, can be handled without risk of spontaneous ignition. Aluminum alkyls in general, toxic materials or that can decompose into toxic components should be stored in cool ventilated place, out of sun, away from fire hazard. Substance must be periodically inspected and monitored. Incompatible materials should be isolated.
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
Protective clothing and high standard of training in necessary precautionary measures are essential for handling of materials.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Use a fully encapsulating, vapor protective clothing should be worn for spills and leaks with no fire. ELIMINATE all ignition sources and prevent all contact with spilled material. Stop leak if you can do it without risk. Cover with DRY earth, DRY sand, or other non-combustible material followed with plastic sheet to minimize spreading or contact with rain. Use clean non-sparking tools to collect material and place it into loosley covered plastic containers for later disposal. This is a generic DOT guideline. EXCEPTION: For Dithionite (Hydrosulfite/Hydrosulphite) spills, UN1384, UN1923 and UN1929, dissolve with 5 parts water and collect for proper disposal.
Stability
Less sensitive to oxidation in air than trialkylaluminums aluminum alkyls.
Incompatibilities
Reacts violently with water extremely reactive with air, moisture, and compounds containing active hydrogen alkyl aluminum compounds reacts violently with a broad range of materials including air and water.

Fire.
Fire fighting
Do not use water, foam, or halogenated extinguishing agents. Stop flow of liquid before extinguishing fire. Use dry chemical or carbon dioxide. Do not use water as straight stream directly on spilled material. Water fog can be used to control fire. Do not use halogenated extinguishing agents on spilled material. Violent reaction may result. Use water spray to keep fire-exposed containers cool. Fight fire from protected location or maximum possible distance.
Fire potential
Ignites spontaneously in air. Certain polymerization catalysts, such as aluminum alkyls, react and burn violently on contact with water. Aluminum alkyls aluminum alkyls are organic aluminum compounds that are highly reactive and dangerous because of spontaneous burning in air. Aluminum alkyls prophoric material in flammable solvent. Vapors are heavier than air and may travel to a source of ignition and flash back.
Hazards
May ignite on contact with moist air or moisture. May burn rapidly with flare-burning effect. May react vigorously or explosively on contact with water. May decompose explosively when heated or involved in a fire. May re-ignite after fire is extinguished.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases.

Health.
Exposure limit(s)
OSHA: PEL (8 h TWA): 15 mg/m3.
Poison_Class
1
Exposure effects
Headache, myalgias, weakness, and paresthesias in both feet have been reported. Aluminum in drinking water has been linked to central nervous system birth defects. Some aluminum compounds have proven teratogenic in laboratory animals; however, overall, aluminum is not considered teratogenic.
   Ingestion
Burns of the esophagus and less commonly the stomach may occur after caustic ingestion; the absence of oral mucosal injury does not reliably exclude esophageal burns. Patients with stridor, drooling or vomiting are more likely to have esophageal burns.
   Inhalation
Stridor, dyspnea, upper airway injury, and pulmonary edema, especially following inhalation of vaporized caustics, may occur.
   Skin
Severe skin irritation and/or burns may occur.
   Eyes
See Skin.

First aid
 
   Ingestion
Mucosal if no respiratory compromise is present, dilute immediately with milk or water; no more than 8 ounces in adults and 4 ounces in children. Gastric ipecac contraindicated. Consider insertion of a small, flexible nasogastric or orogastric tube to suction gastric contents after recent large ingestions; the risk of further mucosal injury must be weighed against potential benefits.
   Inhalation
Move patient to fresh air. Monitor for respiratory distress. If cough or difficulty breathing develops, evaluate for respiratory tract irritation, bronchitis, or pneumonitis. Administer oxygen and assist ventilation as required. Treat bronchospasm with beta2 agonist and corticosteroid aerosols.
   Skin
Remove contaminated clothes. Irrigate exposed skin with copious amounts of water for at least 15 minutes or longer, depending on concentration, amount and duration of exposure to the chemical. A physician may need to examine the area if irritation or pain persist.
   Eyes
Home irrigation - exposed eyes should be irrigated with copious amounts of water for at least 30 minutes. An examination should always be performed. Ophthalmologic consultation should be obtained. Medical facility: irrigate with sterile 0.9% Saline for at least an hour or until the cul-de-sacs are free of particulate matter and returned to neutrality (confirm with pH paper).

Transport.
UN number
3052
Response guide
Hazard class
4.2
Packing Group
I