How to enhance strain-release catalysis in a reaction through orbital alignment from metal catalysts?

The reaction rate of small ring cycloalkane transformations is primarily governed by strain release. The present study summarises how the interplay between substrate strain release and orbital orientations from the transition metal catalyst affects overall catalytic efficiency. Density functional theory (DFT) studies on a Rh(I) metal complex in a [5 + 1] cycloaddition reaction between vinylcyclopropane and CO are summarized. The free energy barriers for oxidative addition on singlet (7.7 kcal mol-1) and triplet (25.6 kcal mol-1) surfaces highlight how optimal orbital orientation in transition metal catalysts synergizes with strain release. The distortion-interaction energy analysis of singlet and triplet states confirmed the mechanism of synergy between strain release and orbital interaction. Distinct spin states tune the kinetics by modulating strain relief and electronic arrangements and effectively lower activation energies, enabling efficient [5 + 1] metal catalysed cycloadditions.