**3. Crystallization of phosphoramidates**

The convenient solvents for obtaining suitable single crystals for the studied compounds may be CH3C(O)CH3, CHCl3, CHCl3/n-C7H16, CH2Cl2, CH3CN, CH3CN/CH3OH, CH3CN/CHCl3, CH3OH, CH3OH/H2O, C2H5OH/n-C6H14, (CH3)2CHOH/n-C6H14, (CH3)2NC(O)H/CHCl3, (CH3)2NC(O)H/CH3OH and n-C6H14. The crystal may be obtained at room temperature after slow evaporation of the solvent.
