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- Constrained_geometry_complex abstract "The term \"constrained geometry complex\" (CGC) (sometimes also referred as Bercaw's Complex) was first used in a patent issued by The Dow Chemical Company for complexes in which a pi-bonded moiety (e.g. cyclopentadienyl) is linked to one of the other ligands on the same metal centre in such a way that the angle at this metal between the centroid of the pi-system and the additional ligand is smaller than in comparable unbridged complexes. More specifically, the term CGC was used for ansa-bridged cyclopentadienyl amido complexes, though the definition goes far beyond this class of compounds. Hence, in the literature the term CGC is frequently used in connection with other more or less related ligand systems that may or may not be isolobal and/or isoelectronic with the ansa-bridged cyclopentadienyl amido ligand system. Furthermore, the term is frequently used for related complexes with long ansa-bridges that induce no strain. Ansa-bridged cyclopentadienyl amido complexes are known for the Group 3, 4, 5, 6 and some Group 8 metals, with the Group 4 congeners being the most studied ones.Like Group 4 metallocenes, suitable Group 4 CGCs may be activated for the polymerisation of ethylene and alpha-olefins by reaction with co-catalysts, e.g. methylaluminoxane (MAO), perfluorinated boranes and trityl borates. The catalytic systems based on CGCs, however, display incorporation of higher alpha-olefins to a much larger extend than comparable metallocene based systems. This superiority of CGCs in copolymerisation reactions is ascribed to (i) a high accessibility of the reactive centre and (ii) a low tendency of the bulk polymer chain to undergo chain transfer reactions. CGC derived polymers are currently marketed by The Dow Chemical Company as part of their INSITE technology. Polymers based upon INSITE technology began commercial production in the early 1990s and today are made at the billion pound scale.Beyond the use of CGCs for polymerisation reactions, a number of other transformations catalysed by CGCs (both of Group 3 and 4 metals) have been reported from academic laboratories. These include the application of CGCs as catalysts for hydrogenation of imines, hydroboration of alkenes, carboalumination of alkenes, hydrosilylation of alkenes, hydroamination/cyclisation of alpha,omega-aminoalkenes and dimerisation of terminal alkynes.".
- Constrained_geometry_complex thumbnail ConstrainedGeomCmpx.png?width=300.
- Constrained_geometry_complex wikiPageID "2732285".
- Constrained_geometry_complex wikiPageLength "3713".
- Constrained_geometry_complex wikiPageOutDegree "33".
- Constrained_geometry_complex wikiPageRevisionID "610844432".
- Constrained_geometry_complex wikiPageWikiLink Alkyne.
- Constrained_geometry_complex wikiPageWikiLink Alpha-olefin.
- Constrained_geometry_complex wikiPageWikiLink Bicyclic_molecule.
- Constrained_geometry_complex wikiPageWikiLink Borane.
- Constrained_geometry_complex wikiPageWikiLink Catalysis.
- Constrained_geometry_complex wikiPageWikiLink Category:Organometallic_chemistry.
- Constrained_geometry_complex wikiPageWikiLink Chain_transfer.
- Constrained_geometry_complex wikiPageWikiLink Congener_(chemistry).
- Constrained_geometry_complex wikiPageWikiLink Cyclopentadienyl_complex.
- Constrained_geometry_complex wikiPageWikiLink Dow_Chemical_Company.
- Constrained_geometry_complex wikiPageWikiLink Ethylene.
- Constrained_geometry_complex wikiPageWikiLink Group_3_element.
- Constrained_geometry_complex wikiPageWikiLink Group_4_element.
- Constrained_geometry_complex wikiPageWikiLink Group_5_element.
- Constrained_geometry_complex wikiPageWikiLink Group_6_element.
- Constrained_geometry_complex wikiPageWikiLink Group_8_element.
- Constrained_geometry_complex wikiPageWikiLink Hydroboration.
- Constrained_geometry_complex wikiPageWikiLink Hydrogenation.
- Constrained_geometry_complex wikiPageWikiLink Hydrosilylation.
- Constrained_geometry_complex wikiPageWikiLink Imine.
- Constrained_geometry_complex wikiPageWikiLink Isoelectronicity.
- Constrained_geometry_complex wikiPageWikiLink Isolobal_principle.
- Constrained_geometry_complex wikiPageWikiLink John_E._Bercaw.
- Constrained_geometry_complex wikiPageWikiLink Ligand.
- Constrained_geometry_complex wikiPageWikiLink Metal.
- Constrained_geometry_complex wikiPageWikiLink Metallocene.
- Constrained_geometry_complex wikiPageWikiLink Methylaluminoxane.
- Constrained_geometry_complex wikiPageWikiLink Patent.
- Constrained_geometry_complex wikiPageWikiLink Pi_bond.
- Constrained_geometry_complex wikiPageWikiLink Polymerization.
- Constrained_geometry_complex wikiPageWikiLink Trityl_borates.
- Constrained_geometry_complex wikiPageWikiLink Van_der_Waals_strain.
- Constrained_geometry_complex wikiPageWikiLink File:ConstrainedGeomCmpx.png.
- Constrained_geometry_complex wikiPageWikiLinkText "Constrained geometry complex".
- Constrained_geometry_complex wikiPageWikiLinkText "constrained geometry complex".
- Constrained_geometry_complex wikiPageUsesTemplate Template:Reflist.
- Constrained_geometry_complex subject Category:Organometallic_chemistry.
- Constrained_geometry_complex comment "The term \"constrained geometry complex\" (CGC) (sometimes also referred as Bercaw's Complex) was first used in a patent issued by The Dow Chemical Company for complexes in which a pi-bonded moiety (e.g. cyclopentadienyl) is linked to one of the other ligands on the same metal centre in such a way that the angle at this metal between the centroid of the pi-system and the additional ligand is smaller than in comparable unbridged complexes.".
- Constrained_geometry_complex label "Constrained geometry complex".
- Constrained_geometry_complex sameAs Q5164362.
- Constrained_geometry_complex sameAs m.07_nwl.
- Constrained_geometry_complex sameAs Q5164362.
- Constrained_geometry_complex wasDerivedFrom Constrained_geometry_complex?oldid=610844432.
- Constrained_geometry_complex depiction ConstrainedGeomCmpx.png.
- Constrained_geometry_complex isPrimaryTopicOf Constrained_geometry_complex.