The first addition of photoinitiator radicals formed by the photolysis of a bisacylphosphine oxide photoinitiator to an acrylate double bond proceeds reversibly (see scheme; R1=tBu, H; R2=MeOC(O), BuOC(O)). Moreover, hydrogen transfer between substituted benzoyl radicals and the growing radical chain explains the formation of aldehydes in such a transformation.
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