Abstract The synthesis of a new rigid analogue of cyclohexyl-TTHA, an efficient lanthanide ligand, as well, as the first complexation trials are reported. This polyaminopolycarboxylic acid, Ph-DTHA 1, was obtained in five steps from phenylenediamine as starting product. The key intermediate was phenylenediethylenetetraamine 4, which after alkylation and hydrolysis gave the expected compound 1 with ten coordination centers.
