Fig. 1: Cleavage of unactivated carbon-carbon bonds.
From: Redox-neutral photocatalytic hydrodealkenylation of aryl olefins

A Oxidative cleavage of C(sp2)=C(sp2) bonds. B Transition-metal-catalyzed cleavage of allylic C(sp3)-C(sp3) bonds. C Oxidative cleavage of C(sp2)-C(sp3) bonds. D Redox-neutral cleavage of C(sp2)-C(sp3) bonds (this work). PCET photo-coupled electron transfer, HAT hydrogen-atom transfer.