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- Ansa-metallocene abstract "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.".
- Ansa-metallocene thumbnail AnsaMetallocene.png?width=300.
- Ansa-metallocene wikiPageID "28721167".
- Ansa-metallocene wikiPageLength "3273".
- Ansa-metallocene wikiPageOutDegree "10".
- Ansa-metallocene wikiPageRevisionID "532055829".
- Ansa-metallocene wikiPageWikiLink Category:Metallocenes.
- Ansa-metallocene wikiPageWikiLink Ferrocene.
- Ansa-metallocene wikiPageWikiLink Ligand.
- Ansa-metallocene wikiPageWikiLink Methylaluminoxane.
- Ansa-metallocene wikiPageWikiLink Polypropylene.
- Ansa-metallocene wikiPageWikiLink Sandwich_compound.
- Ansa-metallocene wikiPageWikiLink Tacticity.
- Ansa-metallocene wikiPageWikiLink Titanocene_dichloride.
- Ansa-metallocene wikiPageWikiLink Ziegler-Natta_catalysis.
- Ansa-metallocene wikiPageWikiLink Ziegler–Natta_catalyst.
- Ansa-metallocene wikiPageWikiLink File:AnsaMetallocene.png.
- Ansa-metallocene wikiPageWikiLinkText "''Ansa''-metallocene".
- Ansa-metallocene wikiPageWikiLinkText "Ansa-metallocene".
- Ansa-metallocene hasPhotoCollection Ansa-metallocene.
- Ansa-metallocene subject Category:Metallocenes.
- Ansa-metallocene hypernym Compound.
- Ansa-metallocene type ChemicalCompound.
- Ansa-metallocene type Cycloalkene.
- Ansa-metallocene comment "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.".
- Ansa-metallocene label "Ansa-metallocene".
- Ansa-metallocene sameAs m.0czf151.
- Ansa-metallocene sameAs Q4770485.
- Ansa-metallocene sameAs Q4770485.
- Ansa-metallocene wasDerivedFrom Ansa-metallocene?oldid=532055829.
- Ansa-metallocene depiction AnsaMetallocene.png.
- Ansa-metallocene isPrimaryTopicOf Ansa-metallocene.