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1-(4-Sulfonphenyl)-3-methyl-5-pyrazolone

3-Methyl-1-(4-sulfophenyl)-2-pyrazolin-5-one

CAS: 89-36-1

Molecular Formula: C10H10N2O4S

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  5. 1-(4-Sulfonphenyl)-3-methyl-5-pyrazolone

1-(4-Sulfonphenyl)-3-methyl-5-pyrazolone - Names and Identifiers

Name 3-Methyl-1-(4-sulfophenyl)-2-pyrazolin-5-one
Synonyms SMP
1-(4-SULFOPHENYL)-3-METHYL-5-PYRAZOLONE
3-Methyl-1-(4-sulfophenyl)-5-pyrazolone
1-(P-SULFOPHENYL)-3-METHYL-5-PYRAZOLONE
1-(4-Sulfophenyl)-3-methyl-5-pyrazolone
3-Methyl-1-(4-sulfonphenyl)-5-pyrazolone
1-(4-SULPHOPHENYL)-3-METHYL-5-PYRAZOLONE
1-(4-Sulfonphenyl)-3-methyl-5-pyrazolone
1-(4'-sulfonylphenyl)-3-methyl-5-pyrazolone
3-Methyl-1-(4-sulfophenyl)-2-pyrazolin-5-one
3-METHYL-1-(P-SULFOPHENYL)-2-PYRAZOLIN-5-ONE
4-(3-methyl-5-oxo-4,5-dihydro-1H-pyrazol-1-yl)benzenesulfonate
4-(3-methyl-5-oxo-4,5-dihydro-1H-pyrazol-1-yl)benzenesulfonic acid
4-(3-methyl-5-oxo-2,5-dihydro-1H-pyrazol-1-yl)benzenesulfonic acid
4-(4,5-Dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)-benzenesulfonic acid
3-Methyl-1-(4-sulfophenyl)-2-pyrazolin-5-one, 4-(3-Methyl-5-oxo-2-pyrazolin-1-yl)benzenesulfonic acid
CAS 89-36-1
EINECS 201-901-3
InChI InChI=1/C10H10N2O4S/c1-7-6-10(13)12(11-7)8-2-4-9(5-3-8)17(14,15)16/h2-5H,6H2,1H3,(H,14,15,16)/p-1
InChIKey CWJQQASJVVAXKL-UHFFFAOYSA-N

1-(4-Sulfonphenyl)-3-methyl-5-pyrazolone - Physico-chemical Properties

Molecular FormulaC10H10N2O4S
Molar Mass254.26
Density1.4456 (rough estimate)
Melting Point>252 °C (dec.) (lit.)
Water Solubility5 g/L (20 ºC)
Vapor Presure0.001Pa at 20℃
AppearanceCrystallization
ColorWhite to Orange to Green
BRN619424
pKapKa 4.90 (H2Ot = 37I = 0.15) (Uncertain)
Storage ConditionSealed in dry,Room Temperature
Refractive Index1.5650 (estimate)
MDLMFCD00020756
Physical and Chemical PropertiesMelting point> 252°C (dec.)
water-soluble 5g/L (20°C)
UseUsed as an intermediate in medicine, dye and pigment

1-(4-Sulfonphenyl)-3-methyl-5-pyrazolone - Risk and Safety

Hazard SymbolsC - Corrosive
Corrosive
Risk Codes34 - Causes burns
Safety DescriptionS26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S36/37/39 - Wear suitable protective clothing, gloves and eye/face protection.
S45 - In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)
UN IDsUN 1759 8/PG 2
WGK Germany1
HS Code29331990
Hazard Class8
Packing GroupII

1-(4-Sulfonphenyl)-3-methyl-5-pyrazolone - Nature

Open Data Verified Data

White needle-like or light yellow crystal, melting point 290~320 ℃ (decomposition). Slightly soluble in hot water, slightly soluble in cold water, soluble in liquid alkali, difficult to dissolve in ethanol, acetic acid, ether.

Last Update：2025-06-10 22:55:16

1-(4-Sulfonphenyl)-3-methyl-5-pyrazolone - Preparation Method

Open Data Verified Data

after diazotization of p-aminobenzenesulfonic acid with sodium nitrite and hydrochloric acid, reduction with sodium bisulfite and sodium carbonate, hydrolysis with sulfuric acid to obtain p-sulfophenylhydrazine, condensation with acetoacetamide, cyclization and acid analysis to obtain pyrazolone.

Last Update：2022-01-01 10:54:03

1-(4-Sulfonphenyl)-3-methyl-5-pyrazolone - Introduction

Solubility in water: 5g/L (20°C).
Last Update：2022-10-16 17:29:37

1-(4-Sulfonphenyl)-3-methyl-5-pyrazolone - Application

Open Data Verified Data

an intermediate for producing dyes such as acid yellow G and weak acid yellow G.

Last Update：2025-08-19 16:24:40

1-(4-Sulfonphenyl)-3-methyl-5-pyrazolone - Safety

Open Data Verified Data
  • see 1-phenyl -3-methyl -5-pyrazolinone.
  • lined with plastic bags, external use of iron drum packaging, each bag of lokg. Store in a cool, ventilated, dry warehouse to prevent sun, heat, moisture. Light loading and light unloading during handling to prevent package breakage.
Last Update：2025-06-10 22:55:16

1-(4-Sulfonphenyl)-3-methyl-5-pyrazolone - Reference Information

LogP-2.04 at 23℃ and pH7
EPA chemical substance information information provided by: ofmpeb.epa.gov (external link)
Use 1-(4-sulfophenyl)-3-methyl-5-pyrazolone as a reagent, for the identification of sulfonic acids as potent exo -5 '-nucleotidase inhibitors. In vitro -5 '-nucleotidase inhibition is considered an attractive approach for cancer therapy.
It is mainly used as an intermediate of dye, pigment and medicine.
production method after diazotization with sulfanilic acid, sodium nitrite and hydrochloric acid, sodium bisulfite and sodium carbonate are used for reduction, P-sulfophenylhydrazine was obtained by hydrolysis with sulfuric acid, condensed with acetoacetamide, cyclized and acid-separated to obtain pyrazolone.
Last Update：2024-04-09 21:01:54
1-(4-Sulfonphenyl)-3-methyl-5-pyrazolone
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1-(4-Sulfonphenyl)-3-methyl-5-pyrazolone
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