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Abbreviations DMPU
CAS number 7226-23-5 YesY
PubChem 81646
ChemSpider 73671 YesY
EC number 230-625-6
Jmol-3D images Image 1
Molecular formula C6H12N2O
Molar mass 128.17 g mol−1
Density 1.064 g/cm3
Melting point −20 °C; −4 °F; 253 K
Boiling point 246 °C (475 °F; 519 K)
Solubility in water miscible
Refractive index (nD) 1.4875-1.4895
MSDS External MSDS
R-phrases R22 R41 R62
S-phrases S26 S36/37/39 S45
Flash point 121 °C (250 °F; 394 K)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 YesY (verify) (what is: YesY/N?)
Infobox references

1,3-Dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone (DMPU) is a cyclic urea sometimes used as a polar, aprotic organic solvent. In 1985, Dieter Seebach showed that it is possible to substitute the relatively toxic hexamethylphosphoramide (HMPA) with DMPU.[1]


  1. ^ Mukhopadhyay, T.; Seebach, D. (1982). "Substitution of HMPT by the cyclic urea DMPU as a cosolvent for highly reactive nucleophiles and bases". Helvetica Chimica Acta 65 (1): 385–391. doi:10.1002/hlca.19820650141. 

Further reading[edit]

  • Dehmlow, E. V. ; Rao, Y. R. (1988). "Phase Transfer Catalytic Preparation of the Dipolar Aprotic Solvents DMI and DMPU". Synthetic Communications 18 (5): 487–494. doi:10.1080/00397918808060741. 
  • Anderson, J. C.; Smith, S. C. (1990). "Oxodiperoxymolybdenum(pyridine)-1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)-pyrimidinone (MoO5 · Py · DMPU): A Safer Alternative to MoOPH for the α-Hydroxylation of Carbonyl Compounds". Synlett 1990 (2): 107–108. doi:10.1055/s-1990-21003.