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Bistitanium chloride, also known as the Nugent–RajanBabu reagent, is the organotitanium compound which exists as a dimer with the formula 2TiCl]2. It is an air sensitive green solid. The complex finds specialized use in synthetic organic chemistry as a single electron reductant.
In the presence of a suitable solvent that can act as a two-electron donor , such as an ether like tetrahydrofuran, the dimer separates and forms a chemical equilibrium between the forms 2TiCl] and 2TiCl]. It is these forms that are responsible for much of the chemical properties of this reagent, which is also the reason that the substance is sometimes written as 2TiCl] or , where Cp represents the cyclopentadienyl anion.
An example of an application of this reagent is in the preparation of vinorelbine, a chemotherapeutic agent which can be prepared in three steps from the naturally-occurring alkaloid leurosine.