Intrigued by the direct formation of the alkene group transfer product, in contrast to previous studies, we turned our attention to investigating the mechanism of the reaction. No conversion was observed when the reaction was performed in the absence of either the photocatalyst, Bu3N or visible light irradiation (see the Supporting Information) which strongly suggests that the reaction goes through a radical mechanism. A control experiment using 10 mol% of Bu3N electron donor produced 20% of product (see the Supporting Information), which indicates that a photoredox-initiated radical chain reaction is not the main pathway.