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3-Methyl-2-pyrazolin-5-one

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3-Methyl-2-pyrazolin-5-one Basic information

Product Name:
3-Methyl-2-pyrazolin-5-one
Synonyms:
  • 3-Methyl-4,5-dihydro-1H-pyrazole-5-one
  • 5-Methyl-2,4-dihydro-3H-pyrazole-3-one
  • 3-Methyl-2-pyrazolin-5-one,99%
  • 3-methyl pyrazole-5-one
  • 3-Methyl-5-pyrazolone, 99%, 99%
  • TIMTEC-BB SBB004372
  • 2-Pyrazolin-5-one, 3-methyl-
  • 3-methyl-2-pyrazolin-5-on
CAS:
108-26-9
MF:
C4H6N2O
MW:
98.1
EINECS:
203-565-3
Mol File:
108-26-9.mol
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3-Methyl-2-pyrazolin-5-one Chemical Properties

Melting point:
220-224 °C
Boiling point:
183.6°C (rough estimate)
Density 
1.1890 (rough estimate)
refractive index 
1.4327 (estimate)
storage temp. 
Sealed in dry,Room Temperature
solubility 
Slightly soluble in ethanol.
pka
13.10±0.40(Predicted)
form 
powder to crystal
color 
White to Light yellow
CAS DataBase Reference
108-26-9(CAS DataBase Reference)
NIST Chemistry Reference
3H-pyrazol-3-one, 2,4-dihydro-5-methyl-(108-26-9)
EPA Substance Registry System
3H-Pyrazol-3-one, 2,4-dihydro-5-methyl- (108-26-9)
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Safety Information

Risk Statements 
36/37/38
Safety Statements 
24/25
WGK Germany 
3
RTECS 
UQ9451500
TSCA 
Yes
HS Code 
29331990
Toxicity
rat,LDLo,unreported,600mg/kg (600mg/kg),Biochemical Pharmacology. Vol. 14, Pg. 1325, 1965.

MSDS

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3-Methyl-2-pyrazolin-5-one Usage And Synthesis

Chemical Properties

3-Methyl-2-pyrazolin-5-one is yellowish powder

Uses

3-Methyl-2-pyrazolin-5-one is used as intermediate for the manufacture of dyestuffs as well as for agrochemicals.

Uses

3-Methyl-2-pyrazolin-5-one is used in the preparation of spirocyclic [indole-3,4'-pyrano[2,3-c]pyrazole] by reacting with isatins and malonitrile in the presence of sodium bromide as electrolyte.

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