Fig. 3: Optimization of reaction conditions.

a Photosensitizers catalyzed hydrogenation of 1,2-dibenzoylethylene 1a with prenol 2a as the hydrogen source. The yields of the target product 4a are highlighted in bold corresponding to the photocatalysts examined. The optimized result is indicated. b Scope of alcohols used for the formation of the target product 4a. Reaction conditions: olefin (0.1 mmol), alcohol (5 equiv.), CH₃CN (2 mL), TBADT (5 mol%), 390 nm LEDs (40 W), 6 h reaction time, room temperature. Yields of 4a are isolated yields. The highest yield of 4a resulting from the use of 2a as the alcohol source is indicated.