The Polymer Society of Korea

Abstract

Proton-coupled electron transfer (PCET) is a key step in many chemical and biological processes. However, despite its importance, many existing PCET reagents are highly unstable and toxic. Furthermore, their practical use is often limited due to low reproducibility, the need for stoichiometric amount, and dependence on rare and expensive transition metals. Inspired by the redox–active nature of quinone, this research seeks to synthesize air and moisture stable high valent titanium complexes supported by hydroquinone derivatives as PCET catalysts. We have focused on the development of a novel class of catalytic H-atom carriers utilizing coordination induced bond weakening between Lewis acidic titanium and π–electron rich bidentate hydroquinone ligand. This approach stabilizes the semiquinone intermediate, effectively weakening the O–H bond and facilitating PCET reactivity. Unlike conventional systems, our strategy provides greater stability and efficiency.