Yields dropped upon increasing the water content to 0.5 mL (Table , entries a-c). Raising the temperature from 25 °C to 50 °C had a positive impact on the performance of catalyst 20, probably by improving the solubility (entries d-f). Overall, the effect the temperature on product formation was small. Increasing the amount of LiCl from 3 equivalents to 5 equivalents increased the product yield for all phase transfer catalysts (entries j-l). Switching to 400 nm with the same LiCl loading did not improve the reaction compared to the 25 °C entries (entries m-o). Summing up, catalyst 19 performed best in the photoreaction but the yields were lower than for the sugar alcohol screening highlighted in Table .