3,5-dimethylpyrazole

CAS Number
67-51-6
EC Number
200-657-5
Abbreviation
DMP

What is 3,5-dimethylpyrazole?

3,5-Dimethylpyrazole (CAS 67-51-6), commonly abbreviated as DMP, is a nitrogen-containing heterocyclic compound used primarily as a nitrification inhibitor in agricultural and industrial applications.

Where is 3,5-dimethylpyrazole used?

  • Agriculture: active component in formulations applied with urea and ammonium-based fertilizers to improve nitrogen use efficiency in crops
  • By blocking the enzymatic conversion of ammonium to nitrate in soil, it extends nitrogen availability and reduces nitrous oxide emissions.
  • Pharmaceuticals: building block for synthesizing pyrazole-containing APIs
  • Its reactive NH group enables controlled derivatization for various intermediates.
  • Water treatment: managing nitrification in wastewater systems and cooling towers
  • Personal care: preservation and stabilization systems requiring heterocyclic nitrogen chemistry

Commercial specifications

  • Purity specifications commonly 98% to 99%+, confirmed by GC or HPLC analysis
  • Packaging in kilogram-scale quantities for laboratory and development use, scaling to bulk drum supply for industrial and agrochemical production

Other Names (Synonyms)

1H-Pyrazole, 3,5-dimethyl-|PYRAZOLE, 3,5-DIMETHYL-|3,5 DMP|TH 564|U 6245|H21N865K9J|TRIXENE DP 8692|DMP

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What are the physical properties of 3,5-dimethylpyrazole?

Melting Point 107.5 °C
Boiling Point 105-125 °C
Density 0,884 g/cm 3
Flash Point 210°C
Appearance White crystal powder
Color White to almost white
Form Crystalline Powder or Crystals
Water Solubility Soluble in water, methanol 0.1 g/mL.
Refractive Index 1.4739 (estimate)
pH 6.7 (14g/l, H2O, 20℃)
Log P 1.010

How is 3,5-dimethylpyrazole classified and handled safely? Learn More

Warning
GHS07· Irritant GHS08· Health Hazard

Hazard Statements

H302 Harmful if swallowed
H315 Causes skin irritation
H319 Causes serious eye irritation
H335 May cause respiratory irritation

Precautionary Statements

P203 Obtain, consult and follow expert instructions for use.
P260 Do not breathe dust/fume/gas/mist/vapours/spray.
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P264 Wash … thoroughly after handling.

Which trade and regulatory codes apply to 3,5-dimethylpyrazole?

HS Code 29331990
Storage Class 13 - Non Combustible Solids
WGK (Germany) 3
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