TRIMETHYLALUMINIUM TMA[Al2(CH3)6]

·         CAS Number 75-24-1

·         Linear Formula (CH₃)₃Al

·         Molecular Weight 72.09

·          Beilstein Registry Number 3587197

·          EC Number 200-853-0

·          MDL number MFCD00008252

·          PubChem Substance ID 24884629

Trimethylaluminium is one of the simplest examples of an organoaluminium compound. Despite its name it has the formulaAl₂(CH₃)₆ (abbreviated as Al₂Me₆ or TMA) as it exists as a dimer.

Detailed Description:

This colorless liquid is an industrially important compound but must be handled with care due to its pyrophoricity; it evolves white smoke (aluminium oxides) when the vapor is released into the air.

Synthesis and applications

TMA is prepared via a two-step process that can be summarized as follows:

2 Al + 6 CH₃Cl + 6 Na → Al₂(CH₃)₆ + 6 NaCl

TMA is mainly used for the production of methylaluminoxane, an activator for Ziegler-Natta catalysts for olefin polymerisation. TMA is also employed as a methylation agent. Tebbe's reagent, which is used for the methylenation of esters and ketones, is prepared from TMA. TMA is often released from sounding rockets as a tracer in studies of upper atmospheric wind patterns.

TMA is also used in semiconductor fabrication to deposit thin film, high-k dielectrics such as Al₂O₃ via the processes of Chemical Vapor Deposition or Atomic Layer Deposition.

TMA forms a complex with the tertiary amine DABCO, which is safer to handle than TMA itself.^[6]

In combination with Cp₂ZrCl₂ (zirconocene dichloride), the (CH₃)₂Al-CH₃ adds "across" alkynes to give vinyl aluminum species that are useful in organic synthesis in a reaction known as carboalumination.^[7]

The NASA ATREX mission (Anomalous Transport Rocket Experiment) employed the white smoke that TMA forms on air contact to study the high altitude jet stream.

Semiconductor grade TMA

TMA is the preferred metalorganic source for metalorganic vapour phase epitaxy (MOVPE) of aluminium-containing compound semiconductors, such as AlAs, AlN, AlP, AlSb, AlGaAs, AlInGaAs, AlInGaP, AlGaN, AlInGaN, AlInGaNP, etc. Criteria for TMA quality focus on (a) elemental impurities, (b) oxygenated and organic impurities.

Packaging

1 L in Sure/Seal

PRICES

$66522.09/KG OR $30237.31/IB

For more information:

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