Decamethyltitanocene Dichloride
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Decamethyltitanocene dichloride is an
organotitanium compound Organotitanium chemistry is the science of organotitanium compounds describing their physical properties, synthesis, and reactions. Organotitanium compounds in organometallic chemistry contain carbon-titanium chemical bonds. They are reagents in or ...
with the formula Cp*2TiCl2 (where Cp* is C5(CH3)5, derived from pentamethylcyclopentadiene). It is a red solid that is soluble in nonpolar organic solvents. The complex has been the subject of extensive research. It is a precursor to many organotitanium complexes. The complex is related to titanocene dichloride, which lacks the methyl groups.


Synthesis and reactions

The complex is prepared by the reaction of
titanium tetrachloride Titanium tetrachloride is the inorganic compound with the formula . It is an important intermediate in the production of titanium metal and the pigment titanium dioxide. is a volatile liquid. Upon contact with humid air, it forms thick clouds o ...
with LiCp*. An intermediate in this synthesis is (pentamethylcyclopentadienyl)titanium trichloride. Reduction of Cp*2TiCl2 in the presence of
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 double bonds). Ethylene i ...
gives the adduct Cp*2Ti(C2H4). The analogous Cp compound has not been prepared, a contrast that highlights the advantages of the Cp* ligand. This
pentamethylcyclopentadienyl 1,2,3,4,5-Pentamethylcyclopentadiene is a cyclic diene with the formula C5Me5H (Me = CH3). 1,2,3,4,5-Pentamethylcyclopentadiene is the precursor to the ligand ''1,2,3,4,5-pentamethylcyclopentadienyl'', which is often denoted Cp* (C5Me5) and read ...
(Cp*) species undergoes many reactions such as cycloadditions of alkynes.* The dicarbonyl complex Cp*2Ti(CO)2 is prepared by reduction of Cp*2TiCl2 in the presence 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 ...
.


Further reading

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References

{{Titanium compounds Metal halides Titanocenes Chloro complexes