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Trimethylaluminium

Trimethylaluminium Suppliers list
Company Name:J & K SCIENTIFIC LTD.  Gold
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Company Name:Shanghai Qiao Chemical Science Co., Ltd  Gold
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Trimethylaluminium Chemical Properties
mp 15 °C
bp 126 °C
density 0.81 g/mL at 25 °C
Fp 40 °F
storage temp. 0-6°C
Water Solubility REACTS
Sensitive Air & Moisture Sensitive
BRN 3587197
CAS DataBase Reference75-24-1(CAS DataBase Reference)
NIST Chemistry ReferenceTrimethylaluminum(75-24-1)
EPA Substance Registry SystemAluminum, trimethyl-(75-24-1)
Safety Information
Hazard Codes F,C,N
Risk Statements 11-14-17-34-50/53-65-67-14/15-63-48/20-51/53-20-62
Safety Statements 26-36/37/39-45-61-62-6A-43A-24/25-16-43-60-33-25-24
RIDADR UN 3399 4.3/PG 1
WGK Germany 3
RTECS BD2204000
1-10
TSCA Yes
HazardClass 4.3
PackingGroup I
MSDS Information
ProviderLanguage
Aluminumtrimethanide English
SigmaAldrich English
ACROS English
ALFA English
Trimethylaluminium Usage And Synthesis
OutlineTrimethylaluminum is called TMA for short. Trimethylaluminum was prepared by Buckton for the first time using methyl mercury and aluminum in 1865, but until the 1950s, TMA applications has been still limited to the scope of laboratory, its research and application was far less active than organic magnesium and organic lithium for a long time. In recent years, with the development of the research of polyolefins, TMA is as one of the cocatalyst, and starting raw materials for synthesis of cocatalyst catalysts methylalumoxane (of MAO) and modified methylaluminoxane (MMAO) in metallocene catalyst systems. In the organic chemical industry, especially polymer chemical industry, its importance began to appear.
At normal temperature and pressure, trimethyl aluminum is a colorless transparent liquid, highly reactive, spontaneous combustion in the air, and instantly be able to fire, reacts violently with alcohol and acids which have an active hydrogen, reacts violently with water, even in cold water explosive decomposition reaction can be produced, and also generates methane, and sometimes can catch fire. At 300 ℃ it slowly decompose to produce methane. It can form stable complexes with AsH3, PH3, ethers, tertiary amines and other Lewis bases, miscible in any proportion with alicyclic hydrocarbons such as hexane and heptane, aromatic hydrocarbon such as toluene, xylene. diluted to below 25% with a hydrocarbon-based solvent, trimethyl aluminum loses its spontaneous combustion.
Main applicationThere is an important use for trimethyl aluminum in organic catalytic chemistry, organic synthesis and polymer chemistry industry and other aspects.
Trimethylaluminum acts with water of a suitable form, may form highly reactive methylaluminoxane (MAO), which is one of the most important co-catalyst of the metallocene catalyst system. The maximum use of MAO is to form a coordination catalyst, such as with the halide of titanium, zirconium, hafnium to form a catalyst system, which can result in stereospecific polymerization, copolymerization, oligomerization of olefins. It can form catalyst with the compound of transition metal element such as nickel, cobalt, etc, which can result in lower poly, disproportionation, isomerization of olefins. Further, trimethyl aluminum itself may be used to catalyze the reaction.
TMA can be carried out oligomerization with ethylene to produce high-carbon aluminum alkyl, after oxidation and hydrolysis of the latter to form a straight-chain higher primary alcohols and advanced a- olefins. Organoaluminum is not only inexpensive, but also has high reaction activity, thus organoaluminum is commonly used for preparing other metals organic compounds, for example the reaction of TMA with stannic chloride can be prepared to produce methyl tin. TMA can also be used as mild reducing agent for high stereoselectivity reagents, vitamins, hormones and other drug synthetic. In recent years, the formation of a metal film is achieved by application of metal organic chemical vapor deposition method. As with the hydrogen carrying TMA, the substrate is heated for thermal decomposition to form a metal thin film of aluminum.
In the aerospace industry, and trimethyl aluminum can be used as liquid fuel of rockets. TMA can also be used as an important alkylating agent in organic synthesis of fine chemical industry.
As olefin polymerization catalyst, pyrophoric fuel, also used for making straight-chain primary alcohols and olefins, etc, it can be used for metal organic chemical vapor deposition.
The above information is edited by the chemicalbook of Yan Yanyong.
CategorySpontaneous Combustion items
Toxicity gradingToxic
Acute toxicityOral - rat LD50: 10000 mg / cubic meter / 15 minutes
Flammability hazard characteristicsIn case of air, chlorine, oxidizers, high temperature can be spontaneous, emit toxic aluminide gases.
Storage CharacteristicsTreasury ventilation low-temperature drying, package with nitrogen charging, and stored separately from oxidants
Extinguishing agentDry sand, powder, mountain flour
Occupational standardsTWA 2 mg(AL) / cubic meter
Chemical Propertiesclear colorless solution
Tag:Trimethylaluminium(75-24-1) Related Product Information
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