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| Section2 = | Section3 = }} Ethylaluminium sesquichloride, also called EASC, is an industrially important organoaluminium compound used primarily as a precursor to triethylaluminium and as a catalyst component in Ziegler-Natta type systems for olefin and diene polymerizations. Other applications include use in alkylation reactions and as a catalyst component in linear oligomerization and cyclization of unsaturated hydrocarbons.< EASC is a colourless liquid, spontaneously combustible in air and reacts violently when in contact with water and many other compounds.〔(Aluminum alkyls. Albemarle Corporation ), 2010〕 == Production== Methyl, ethyl, and other alkyl or aralkyl halides that are not dehydrohalogenated readily can react with aluminium metal in an exothermic process to form organoaluminium sesquihalides in high yields. An important example is the reaction of ethyl chloride with aluminium to form ethylaluminium sesquichloride. :3 C2H5Cl + 2 Al → (C2H5)3Al2Cl3 The reaction is carried out with aluminium in the form of turnings, shavings, granules, or powder. Oxygen and moisture must be rigorously excluded. The reaction can be initiated with a small amount of mercury or iodine. It also can be started by treating the aluminium with an alkylaluminium halide. The products are equilibrium mixtures of the codimer (R2AlX • RAlX2) and homodimers (and (RAlX2)2 ), in which the two aluminium atoms of each component are halogen-bridged. When byproduct reactions take place to a significant extent, the excess Al – Cl content in the R3Al2Cl3 product can be decreased by addition of the calculated amount of triethylaluminium. Overall, however, it is critical to control reaction conditions as slight excursions can result in catastrophic events. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ethylaluminium sesquichloride」の詳細全文を読む スポンサード リンク
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