Titanium-Catalyzed Synthesis of Organic Complexes

Titanium occupies a unique position among early transition metals, combining high oxophilicity with versatile redox chemistry that underpins a broad array of catalytic transformations. In its low‐valent forms, titanium centres engage in oxidative cyclisations, reductive cross‐couplings and ring‐opening processes, whereas high‐valent Ti(IV) species serve in group‐transfer and insertion reactions. Central to these advances is the design of supporting ligands to fine‐tune electronic donor ability and steric profile, thereby controlling activity and selectivity. Modern studies reveal unconventional pathways for bond formation, such as ligand‐assisted reductive elimination via masked Ti(II) intermediates and back‐donation into unsaturated π‐systems. Such insights have unlocked catalytic routes to heterocycles, amines, imines and conjugated building blocks. Computational models now link ligand parameters—such as buried volume and donor strength—to reaction rates, allowing predictive optimisation of catalyst structure. Practical applications range from pharmaceutical intermediate assembly to sustainable routes for nitrogen‐containing fine chemicals, demonstrating the global significance of titanium‐based catalysis as an earth‐abundant alternative to noble metals.

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Titanium-Catalyzed Synthesis of Organic Complexes publication trend

The graph below shows the total number of articles in titanium-catalyzed synthesis of organic complexes across all publications each year (not limited to Nature Index journals).

Technical terms

Ligand donor parameter (LDP): A quantitative measure of a ligand’s electronic donation to the metal centre, derived from spectroscopic or computational data.

Percent buried volume (%Vbur): A steric descriptor indicating the fraction of a sphere around the metal centre occupied by a ligand, used to assess steric hindrance.

Reductive elimination: A fundamental elementary step in which two ligands bound to a metal centre couple to form a new bond, reducing the metal’s oxidation state.

Metallacycle: A cyclic complex in which the metal is incorporated into the ring backbone, often serving as a key intermediate in catalytic cycles.

Curtin–Hammett principle: A kinetic concept that product distribution is determined by the relative free energy barriers of transition states arising from rapidly interconverting intermediates, rather than their ground‐state populations.

References

1. Modeling Complex Ligands for High Oxidation State Catalysis: Titanium Hydroamination with Unsymmetrical Ligands. ACS Catalysis (2024).
2. Differences between the elimination of early and late transition metals: DFT mechanistic insights into the titanium-catalyzed synthesis of pyrroles from alkynes and diazenes. Chemical Science (2017).
3. Ti-catalyzed ring-opening oxidative amination of methylenecyclopropanes with diazenes. Chemical Science (2020).