Dicarbonylbis(cyclopentadienyl)titanium is the

chemical compound A chemical compound is a chemical substance composed of many identical molecules (or molecular entities) containing atoms from more than one chemical element held together by chemical bonds. A molecule consisting of atoms of only one element ...

with the formula (''η''⁵-C₅H₅)₂Ti(CO)₂, abbreviated Cp₂Ti(CO)₂. This maroon-coloured, air-sensitive species is soluble in

aliphatic In organic chemistry, hydrocarbons ( compounds composed solely of carbon and hydrogen) are divided into two classes: aromatic compounds and aliphatic compounds (; G. ''aleiphar'', fat, oil). Aliphatic compounds can be saturated, like hexane, ...

and

aromatic In chemistry, aromaticity is a chemical property of cyclic ( ring-shaped), ''typically'' planar (flat) molecular structures with pi bonds in resonance (those containing delocalized electrons) that gives increased stability compared to satur ...

solvents. It has been used for the

deoxygenation Deoxygenation is a chemical reaction involving the removal of oxygen atoms from a molecule. The term also refers to the removal of molecular oxygen (O2) from gases and solvents, a step in air-free technique and gas purifiers. As applied to orga ...

of sulfoxides, reductive coupling of

aldehydes In organic chemistry, an aldehyde () is an organic compound containing a functional group with the structure . The functional group itself (without the "R" side chain) can be referred to as an aldehyde but can also be classified as a formyl grou ...

and reduction of

Structure and synthesis

Cp₂Ti(CO)₂ is prepared by the reduction of

titanocene dichloride Titanocene dichloride is the organotitanium compound with the formula ( ''η''5-C5H5)2TiCl2, commonly abbreviated as Cp2TiCl2. This metallocene is a common reagent in organometallic and organic synthesis. It exists as a bright red solid that slowl ...

with

magnesium Magnesium is a chemical element with the symbol Mg and atomic number 12. It is a shiny gray metal having a low density, low melting point and high chemical reactivity. Like the other alkaline earth metals (group 2 of the periodic ta ...

as a slurry in THT under an atmosphere of

carbon monoxide Carbon monoxide (chemical formula CO) is a colorless, poisonous, odorless, tasteless, flammable gas that is slightly less dense than air. Carbon monoxide consists of one carbon atom and one oxygen atom connected by a triple bond. It is the simple ...

. :(C₅H₅)₂TiCl₂ + Mg + 2 CO → (C₅H₅)₂Ti(CO)₂ + MgCl₂ Both Cp₂Ti(CO)₂ and Cp₂TiCl₂ are tetrahedral as are related zirconium and hafnium compounds. Of historical interest, the complex was first prepared by the reduction of

with sodium cyclopentadienyl under an atmosphere of

. Its structure has been confirmed by

X-ray crystallography X-ray crystallography is the experimental science determining the atomic and molecular structure of a crystal, in which the crystalline structure causes a beam of incident X-rays to diffract into many specific directions. By measuring the angles ...

References

{{Titanium compounds Titanocenes Organotitanium compounds Carbonyl complexes Cyclopentadienyl complexes Titanium(II) compounds