Bis(cyclopentadienyl)titanium(III) chloride

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 [(C5H5)2TiCl] or [Cp2TiCl], where Cp− represents the cyclopentadienyl anion.

[5] The compound is also known as the Nugent–RajanBabu reagent, after scientists William A. Nugent and T. V. (Babu) RajanBabu, and has found applications in free radical and organometallic chemistry.

[14][18] Addition of a hydrochloride salt to the reaction facilitates release of the oxygen-bound titanium(IV) intermediate, allowing the reagent to be recycled.

[19] The Madagascan periwinkle Catharanthus roseus L. is the source for a number of important natural products, including catharanthine and vindoline[20] and the vinca alkaloids it produces from them: leurosine and the chemotherapy agents vinblastine and vincristine, all of which can be obtained from the plant.

Another application involves the single electron reduction of enones to generate allylic radicals which can undergo intermolecular trapping with acrylonitriles to afford Michael type adducts.

[33] The complex transfers a single electron to the coordinated substrate generating an alkyl centered radical and an oxygen bound titanium(IV) species.

Nugent–RajanBabu reagent synthesis and equilibrium in solution
The calculated spin density of the ground state singlet biradical (broken symmetry density functional theory, TPSSh/def2-TZVP).
Example of Barbier -type reaction catalysed by Cp 2 TiCl
Catalytic modification: addition of a mildly acidic HCl salt promotes cleavage of the Ti IV –O bond and allows regeneration of Cp 2 Ti III Cl using a stoichiometric reductant