“…The most promising results have been obtained so far with the so-called Jacobson catalyst that was chosen also for this study (see Figure 3). As an alternative, as well as a more controllable method [6,11,13,29,40,41], organocatalysis has already attracted some interest, as the chemicals used avoid high-pressure processes and can theoretically be run in closed-loop processes [21,22,36] and are based on renewable raw materials (reduced mandelic acid). The reaction also leads to high conversion of the raw material avoiding intensive separations [21,22].…”