1,3-dimethylurea

CAS Number
96-31-1
EC Number
202-498-7
Abbreviation
DMU

What is 1,3-dimethylurea?

1,3-Dimethylurea (CAS 96-31-1), commonly abbreviated as DMU, is a symmetric disubstituted urea derivative used as a chemical intermediate and reagent in pharmaceutical and specialty chemical manufacturing.

Where is 1,3-dimethylurea used?

  • Pharmaceutical manufacturing: intermediate in the synthesis of active pharmaceutical ingredients, including methylxanthine derivatives and heterocyclic compounds requiring a dimethylurea scaffold
  • Biotechnology research and process chemistry: stabilises pH in buffered reaction media, supporting enzyme activity and cell culture conditions
  • Catalyst precursor applications: preparation of nitrogen-containing ligands and coordination complexes for specialty chemical synthesis
  • Personal care formulators incorporate it into preservation systems where controlled release of antimicrobial activity is required.

Good to know: Specifications are aligned to USP and Ph. Eur. reference standards where required.

Commercial specifications

  • Higher-purity grades suitable for pharmaceutical intermediate use
  • Packaging from kilogram-scale laboratory quantities to bulk industrial supply

Other Names (Synonyms)

N,N'-Dimethylurea|sym-Dimethylurea|Urea, N,N'-dimethyl-|Symmetric dimethylurea|Urea, 1,3-dimethyl-|N,N'-Dimethylharnstoff|WAM6DR9I4X|DMU

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What are the physical properties of 1,3-dimethylurea?

Melting Point 108 °C
Boiling Point 268-270 °C
Density 1.142 g/cm³
Flash Point 157 °C
Appearance white crystals
Color White
Form Crystals
Water Solubility 765 g/L (21.5 ºC)
Vapor Pressure 6 hPa (115 °C)
Refractive Index 1.4715 (estimate)
pH 9.0-9.5 (100g/l, H2O, 20℃)
Log P -0.783 at 25℃

How is 1,3-dimethylurea classified and handled safely? Learn More

Warning
GHS08· Health Hazard

Hazard Statements

H373 May causes damage to organs through prolonged or repeated exposure

Precautionary Statements

P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P319 Get medical advice/attention if you feel unwell.
P501 Dispose of contents/container in accordance with local regulations.

Which trade and regulatory codes apply to 1,3-dimethylurea?

HS Code 29241900
Storage Class 11 - Combustible Solids
WGK (Germany) 1
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