The invention relates to novel compounds which are useful as ligands of actinides, to the synthesis of these compounds and to their uses.These compounds fit the general formula (I) hereafter: wherein R1 and R2, either identical or different, represent H, a linear or branched, saturated or unsaturated C1-C12 hydrocarbon group, a phenyl, benzyl, diphenyl or tolyl group; R3 represents H, a linear or branched, saturated or unsaturated C1-C12 hydrocarbon group, a phenyl, tolyl or linear or branched C1-C12 alkoxy group; while R4 represents H, a linear or branched, saturated or unsaturated C1-C12 hydrocarbon group, a phenyl or tolyl group. Field of applications: the processing of used nuclear fuels via a hydrometallurgical route.