leading to the development of enantioselectivedesymmetrizing, bromolactonizationreactions of symmetricolefinicdicarboxylicacids, which are promoted by a C3‐symmetric trisimidazoline catalyst, are described. These processes generated carboxylic‐acid‐containing bromolactones in moderately high enantiomeric excesses. The results of optimization studies showed that reactions in a mixed solvent system