Dicarbonylbistitanium is the chemical compound

Chemical compound

A chemical compound is a pure chemical substance consisting of two or more different chemical elements that can be separated into simpler substances by chemical reactions. Chemical compounds have a unique and defined chemical structure; they consist of a fixed ratio of atoms that are held together...

 with the formula (η⁵-C₅H₅)₂Ti(CO)₂, abbreviated Cp₂Ti(CO)₂. This maroon-coloured, air-sensitive species is soluble in aliphatic and aromatic solvents. It has been used for the deoxygenation

Deoxygenation

Deoxygenation is a chemical reaction involving the removal of molecular oxygen from a reaction mixture or solvent, or the removal of oxygen atoms from a molecule.Classic representatives of deoxygenation are:...

 of sulfoxides, reductive coupling of aromatic aldehydes and reduction of aldehydes

Structure and synthesis

Cp₂Ti(CO)₂ is prepared via the reduction of titanocene dichloride

Titanocene dichloride

Titanocene dichloride is the organotitanium compound with the formula 2TiCl2, commonly abbreviated as Cp2TiCl2. This metallocene is a common reagent in organometallic and organic synthesis. It exists as a bright red solid that slowly hydrolyzes in air...

 with magnesium

Magnesium

Magnesium is a chemical element with the symbol Mg, atomic number 12, and common oxidation number +2. It is an alkaline earth metal and the eighth most abundant element in the Earth's crust and ninth in the known universe as a whole...

 under an atmosphere of carbon monoxide

Carbon monoxide

Carbon monoxide , also called carbonous oxide, is a colorless, odorless, and tasteless gas that is slightly lighter than air. It is highly toxic to humans and animals in higher quantities, although it is also produced in normal animal metabolism in low quantities, and is thought to have some normal...

.₂TiCl₂ + Mg + 2 CO → (C₅H₅)₂Ti(CO)₂ + MgCl₂
Both Cp₂Ti(CO)₂ and Cp₂TiCl₂ are tetrahedral as are related zirconium and hafnium compounds.