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An ''ansa''-metallocene is a type of organometallic compound containing two cyclopentadienyl ligands that are linked by a bridging group such that both cyclopentadienyl groups are bound to the same metal. The link prevents rotation of the cyclopentadienyl ligand and often modifies the structure and reactivity of the metal center. Some ansa-metallocenes are active in Ziegler-Natta catalysis, although none are used commercially. The term ''ansa''-metallocene (ansa being Greek for "handle") was coined by Lüttringhaus and Kullick to describe alkylidene-bridged ferrocenes, which were developed in the 1950s. Often ''ansa''-metallocenes are described in terms of the angle defined by the two Cp rings. In titanocene dichloride, this angle is 58.5° whereas in the ''ansa''-titanocene Me2Si(C5H4)2TiCl2 the angle is 51.2°. The prototypical linker groups are of the type (CH2)n where n = 1, 2, and 3. More easily installed are linker groups consisting of heteroatoms, e.g. (CH3)2Si. One potential application of ''ansa''-metallocenes is in polymerisation reactions. Specifically, the ansa bridge allows greater control of the stereochemistry at the metal centre. For example, three distinct ''ansa''-zirconocene dichloride catalysts used in the synthesis of polypropylene in the presence of methylaluminoxane (MAO) can be used to direct whether the product is syndiotactic, isotactic, or atactic. ==References== 〔 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「Ansa-metallocene」の詳細全文を読む スポンサード リンク
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