For 50 °C the yield became lower for D-fructose and improved for dulcitol, which showed poor water-solubility at room temperature (entries g and h). At 30 °C D-fructose as an additive leads to 42% of 12a/b (entries i and j). Once 5 equivalents of LiCl were added to the reaction mixture D-fructose worked most efficiently (entries k-l) whereas the change to 400 nm did not lead to an improved catalyst performance (entries n-p). In general, the yield of products 12a and b could be slightly increased for entries j, m, n, and o compared to the reaction without additive (Scheme 5). A slight change in colour towards deep yellow was noted upon the addition of D-fructose or LiCl to FeCl3•6H2O. However, changes in the absorption spectra of FeCl3•6H2O upon the additive addition are not pronounced (Spectrum 1).