2,2′-Bis(2-indenyl) biphenyl is an organic compound with the formula ₆H₄C₉H₇sub>2. The compound is the precursor, upon deprotonation, to ansa-metallocene complexes within the area of

transition metal indenyl complex In organometallic chemistry, a transition metal indenyl complex is a coordination compound that contains one or more indenyl ligands. The indenyl ligand is formally the anion derived from deprotonation of indene. The η5-indenyl ligand is related ...

es. Metals studied with 2,2′-bis(2-indenyl) biphenyl include

titanium Titanium is a chemical element; it has symbol Ti and atomic number 22. Found in nature only as an oxide, it can be reduced to produce a lustrous transition metal with a silver color, low density, and high strength, resistant to corrosion in ...

zirconium Zirconium is a chemical element; it has Symbol (chemistry), symbol Zr and atomic number 40. First identified in 1789, isolated in impure form in 1824, and manufactured at scale by 1925, pure zirconium is a lustrous transition metal with a greyis ...

, and

hafnium Hafnium is a chemical element; it has symbol Hf and atomic number 72. A lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals. Its existence was predicted by Dm ...

. The ligand and its complexes have been prepared by the research group of the late Brice Bosnich at

The University of Chicago The University of Chicago (UChicago, Chicago, or UChi) is a private research university in Chicago, Illinois, United States. Its main campus is in the Hyde Park neighborhood on Chicago's South Side, near the shore of Lake Michigan about fr ...

. Zirconium and hafnium complexes made from this ligand were found to be active catalysts for the polymerization of the smallest

alkenes In organic chemistry, an alkene, or olefin, is a hydrocarbon containing a carbon–carbon double bond. The double bond may be internal or at the terminal position. Terminal alkenes are also known as Alpha-olefin, α-olefins. The Internationa ...

– compounds with carbon-carbon double bonds—namely,

ethylene Ethylene (IUPAC name: ethene) is a hydrocarbon which has the formula or . It is a colourless, flammable gas with a faint "sweet and musky" odour when pure. It is the simplest alkene (a hydrocarbon with carbon–carbon bond, carbon–carbon doub ...

and

propylene Propylene, also known as propene, is an unsaturated organic compound with the chemical formula . It has one double bond, and is the second simplest member of the alkene class of hydrocarbons. It is a colorless gas with a faint petroleum-like o ...

. The use of such complexes in the

polymerization In polymer chemistry, polymerization (American English), or polymerisation (British English), is a process of reacting monomer molecules together in a chemical reaction to form polymer chains or three-dimensional networks. There are many fo ...

has since been reported, and patented by DSM Research.

References

{{DEFAULTSORT:Bis(2-indenyl) biphenyl, 2,2' Ligands Catalysts Hydrocarbons