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LFERs connecting strain release and reactivity. (a) According to Marcus theory, an increase in reaction driving force (ΔEr) causes an earlier curve crossing, lowering the TS energy (ΔE‡) relative to the intrinsic activation barrier (ΔE‡int). (b) Increasing bond delocalization decreases ΔE‡int, causing a lower energy, earlier curve crossing. (c) Increasing the reaction driving force and bond delocalization combine to enhance reactivity.
