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Dichlorosulfophenyl-3-methylpyrazolone

Dichlorosulfophenyl-3-methylpyrazolone

CAS: 84-57-1

Molecular Formula: C10H8Cl2N2O4S

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Dichlorosulfophenyl-3-methylpyrazolone - Names and Identifiers

Name Dichlorosulfophenyl-3-methylpyrazolone
Synonyms 254CSMP
4-Acetylbutyric acid ethyl ester
dichlorsulfofenyl-methylpyrazolon
Dichlorosulfophenyl-3-methylpyrazolone
1-(2',5'-Dichloro-4'-Sulfo)phenyl-3-Methyl-5-Pyrazolone
1-(2',5'-Dichloro-4'-sulfophenyl)-3-methyl-5-pyrazolone
1-(2,5-Dichloro-4-sulfophenyl)-3-methyl-5(4H)-pyrazolone
1-(2,5-Dichloro-4-sulfophenyl)-3-methyl-2-pyrazolin-5-one
2,3-dichloro-6-(5-methyl-3-oxo-1H-pyrazol-2-yl)benzenesulfonic acid
2,5-dichloro-4-(3-methyl-5-oxo-2-pyrazolin-1-yl)-benzenesulfonicaci
2,5-Dichloro-4-(3-methyl-5-oxo-2-pyrazolin-1-yl)benzenesulphonic acid
benzenesulfonicacid,2,5-dichloro-4-(4,5-dihydro-3-methyl-5-oxo-1h-pyrazol-1
benzenesulfonicacid,2,5-dichloro-4-(4,5-dihydro-3-methyl-5-oxo-1h-pyrazol-1-y
2,5-dichloro-4-(4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)-Benzenesulfonicacid
CAS 84-57-1
EINECS 201-541-7
InChI InChI=1/C10H8Cl2N2O4S/c1-5-4-8(15)14(13-5)7-3-2-6(11)9(12)10(7)19(16,17)18/h2-4,13H,1H3,(H,16,17,18)

Dichlorosulfophenyl-3-methylpyrazolone - Physico-chemical Properties

Molecular FormulaC10H8Cl2N2O4S
Molar Mass323.15
Density1.5186 (rough estimate)
Melting Point346°C (dec.)(lit.)
Appearancepowder to crystal
ColorWhite to Orange to Green
pKa-1.41±0.50(Predicted)
Storage ConditionRoom Temprature
Refractive Index1.6000 (estimate)
MDLMFCD00035706
Physical and Chemical PropertiesCharacter white or yellow crystalline powder.
soluble in water and ethanol, soluble in alkali, slightly soluble in ether.
UseFor the synthesis of C.I. Acid yellow 17, C.I. Acid orange 40, C.I. Reactive yellow 1 and other reactive dyes

Dichlorosulfophenyl-3-methylpyrazolone - Risk and Safety

Hazard SymbolsXi - Irritant
Irritant
Risk Codes36/37/38 - Irritating to eyes, respiratory system and skin.
Safety DescriptionS26 - In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S36 - Wear suitable protective clothing.
WGK Germany3
RTECSDB6040000

Dichlorosulfophenyl-3-methylpyrazolone - Upstream Downstream Industry

Raw Materialsdiketene
Sodium bisulfite
Sodium bisulfite
Nicotinic acid

Dichlorosulfophenyl-3-methylpyrazolone - Nature

Open Data Verified Data

white or yellow crystalline powder, soluble in water and ethanol, soluble in alkali, slightly soluble in ether.

Last Update：2024-01-02 23:10:35

Dichlorosulfophenyl-3-methylpyrazolone - Preparation Method

Open Data Verified Data

2, 5-chloroaniline was sulfonated and then diazotized with sodium nitrite. The diazonium salt is reduced by sodium sulfite and sodium bisulfite to give 2, 5-chloro-4-sulfonylphenylhydrazine sulfonate sodium salt, which is acidified by sulfuric acid to form sulfate, then condensed with ethyl acetoacetate, and then neutralized by soda ash to remove ethyl ester, re-acidification to obtain finished product.

Last Update：2022-01-01 10:54:05

Dichlorosulfophenyl-3-methylpyrazolone - Application

Open Data Verified Data

dye intermediates, mainly used in the manufacture of acid yellow 2G and active yellow M-5G,K-6G,X-6G and so on.

Last Update：2025-08-19 16:24:40

Dichlorosulfophenyl-3-methylpyrazolone - Safety

Open Data Verified Data
  • low toxicity, its toxicity and protection method see 1-phenyl -3-methyl -5-pyrazolinone.
  • It is packed in an iron drum lined with plastic bags. 30kg or 50kg per bucket. Store in a cool and ventilated place. Prevent heat and moisture. According to the general provisions of the storage and transportation of chemicals.
Last Update：2025-06-10 22:55:16

Dichlorosulfophenyl-3-methylpyrazolone - Reference Information

EPA chemical substance information information provided by: ofmpeb.epa.gov (external link)
Use for the synthesis of C.I. Acid yellow 17, C.I. Acid orange 40, C.I. Reactive yellow 1 and other reactive dyes
production method 2, 5-dichloroaniline was sulfonated and then diazotized with sodium nitrite. The diazonium salt is reduced by sodium sulfite and sodium bisulfite to obtain sodium 2, 5-dichloro-4-sulfonylphenylhydrazine sulfonate, which is acidified by sulfuric acid to form sulfate, then condensed with ethyl acetoacetate, and then neutralized by soda ash to remove ethyl ester, re-acidification to obtain finished product.
Last Update：2024-04-09 15:16:53
Dichlorosulfophenyl-3-methylpyrazolone
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CAS: 84-57-1
Tel: 18301782025
Email: 3008007409@qq.com
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CAS: 84-57-1
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View History
Dichlorosulfophenyl-3-methylpyrazolone
17154-34-6
酸性嫩黄 PL
1430561-06-0
1-Tetradecyl bromide
12262-07-6
61789-40-0
茯苓醇
3-ETHYNYLPHENOL
颜料红269
Raw Materials for Dichlorosulfophenyl-3-methylpyrazolone
diketene
Sodium bisulfite
Sodium bisulfite
Nicotinic acid
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