Abstract Perfluoroalkylated dimorpholinophosphoramidates, 1–4, were synthesized in 65– 80% yield by phosphorylation of the appropriate perfluoroalkylated alcohol by phosphorus oxytrichloride, followed by reaction with morpholine. Preliminary biological tests (effect on cell cultures, hemolysis of red blood cells, and acute in vivo toxicity in mice) performed on compounds 1 to 5 show that the F-alkylated derivatives 1 to 4 are better tolerated than ...