Recent developments on the transformation of CO utilising ligand cooperation and related strategies.

A portfolio of value-added chemicals, fuels and building block compounds can be envisioned from CO on an industrial scale. The high kinetic and thermodynamic stabilities of CO, however, present a significant barrier to its utilisation as a C1 source. In this context, metal-ligand cooperation methodologies have emerged as one of the most dominant strategies for the transformation of the CO molecule over the last decade or so. This review focuses on the advancements in CO transformation using these cooperative methodologies. Different and well-studied ligand cooperation methodologies, such as dearomatisation-aromatisation type cooperation, bimetallic cooperation (M⋯M'; M' = main group or transition metal) and other related strategies are also discussed. Furthermore, the cooperative bond activations are subdivided based on the number of atoms connecting the reactive centre in the ligand framework (spacer/linker length) and the transition metal. Several similarities across these seemingly distinct cooperative methodologies are emphasised. Finally, this review brings out the challenges ahead in developing catalytic systems from these CO transformations.