Triethyl aluminum agent

Triethyl- aluminum Spontaneously ignites in air at all temperatures Not pertinent Not pertinent Inert powders such as limestone or sand, or dry chemical Water, foam, halogenated extinguishing agents Dense smoke of aluminum oxide is formed. Contact with water on adjacent fires causes violent reaction producing toxic and flammable gases Not pertinent Reacts violently to form flammable ethane gas ... 

In 1994, Finkelmann and coworkers [83] first reported LC-coil block copolymers with anionic polymerization of mesogenic methacrylates (see Scheme 7 E). However, monomer purification was a problem due to the crystalline nature of the mesogenic monomer. Finkelmann et al. used triethyl aluminum as an in-situ drying agent for successful anionic polymerization to obtain block copolymers with high molecular weights and narrow polydispersity... 

Addition polymerization can be accomplished not only through a free radical initiator as mentioned above, but also by some other means. The most important polymerization catalyst is of the type known as Ziegler-Natta catalyst. These two chemists discovered that a combination of chemicals titanium tetrachloride and triethyl aluminum is an excellent catalyst for polymerizing a number of olefins. They were awarded Nobel Prize in 1963 for this discovery. Subsequent research by others found that similar combinations of chemicals a transition element compound and triethyl aluminum or similar alkylating agent do catalyze polymerization of olefins. Specific combination of such chemicals allow formation of polymers of specific stereochemistry. 

Attempts to convert the sulfones back into PASHs have been successful with a number of agents such as various metals (zinc, tin, magnesium, aluminum, iron, and nickel) in acetic acid, palladium on carbon with hydrazine, stannous chloride, lithium triethylborohydride, diphenylsi-lane, sodium borohydride, boron trifluoride, dicyclohexylcarbodiimide, triethyl phosphite, dimethyl dichlorosUane with lithium aluminum hydride, diphenylsilane, and triphenyl phosphine with iodine. However, none of them cleanly effect this conversion. 

This reducing agent is prepared from lithium aluminum hydride and triethyl-ammonium chloride (82% yield). It is more stable than aluminum hydride. 

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