... 2,5,8,11-Tetraoxatridecan-13-oic acid (TOTOA) was prepared in high purity (>99 %, GC) according to a modified procedure described by Matsushima et al.18 Ionic liquids were easily obtained by neutralizing the acid ... Grobelny et al. ... 10 C. J. Pedersen, H. K. Frensdorff, Angew. ...