【 Application 】

1. Application in organic catalytic chemistry

Catalysts composed of transition metal elements such as nickel and cobalt can oligomerize, mutate and isomerize alkenes. In addition, TMA itself can be used to catalyze reactions.

2 Applications in organic synthesis

TMA can be oligomerized with ethylene to form high-carbon alkyl aluminum, which is oxidized and hydrolyzed to form straight-chain advanced primary alcohols and advanced alpha-olefin. Organoaluminum is not only cheap, and high reactivity, so it is commonly used to prepare other organometallic compounds, such as TMA reaction with tin chloride can be prepared methyl tin. TMA can also be used as a mild reducing agent for the synthesis of high stereoselectivity reaction reagents, vitamins, hormones and other drugs. In recent years, the formation of metal films is achieved by chemical vapor deposition of metallic organics. If hydrogen is used to carry TMA, the metal aluminum film can be formed by thermal decomposition on the heated substrate.

3 Application in polymer chemical industry

In the early 1950s, Ziegler discovered that complexes formed with alkyl aluminum and TiCl4 allowed ethylene to polymerize into polyethylene at very low or atmospheric pressures. Subsequently, Natta found that a catalytic system formed with alkyl aluminum and transition metal salts resulted in a directed polymerization of alkenes. Several years later, the catalytic system was put into large-scale production or established the basis of industrialization in many aspects such as polyα-olefin, polydiolefin and olefin copolymer. Nowadays, the research progress of metallocene catalysts is relatively rapid. The polymers formed under the action of this catalytic system have many excellent properties, such as narrow molecular mass distribution, high structural normality, good optical transparency, good radiation resistance, low signal-to-noise ratio, high strength, high melting point, chemical resistance, water resistance, steam resistance and so on.

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