2,4-dihydro-2-[4-[(2-hydroxyethyl)sulfonyl]phenyl]-5-methyl-3H-pyrazol-3-one

2,4-二氢-2-[4-[(2-羟基乙基)磺酰基]苯基]-5-甲基-3H-吡唑-3-酮

Also known as: 1-(4-beta-hydroxyethylsulfonylphenyl-)3-methyl-5-pyrazolone, 1-(4-beta-hydroxyethylsulfonylphenyl-)-3-methyl-5-pyrazolone(oxethylsulfonepyrazolone), 1-[4-(2-hydroxyethylsulfonyl)phenyl]-3-methyl-2-pyrazolin-5-one, 1-[4-(2-hydroxyethyl)sulfonylphenyl]-3-methyl-1H-pyrazol-5(4H)-one, 2,4-dihydro-2-[4-[(2-hydroxyethyl)sulphonyl]phenyl]-5-methyl-3H-pyrazol-3-one, 2,4-dihydro-2-[4-[(2-hydroxyethyl)sulfonyl]phenyl]-5-methyl-3h-pyrazol-3-on, 2-[4-(2-hydroxyethylsulfonyl)phenyl]-5-methyl-4H-pyrazol-3-one, 2-Pyrazolin-5-one, 1-(p-((2-hydroxyethyl)sulfonyl)phenyl)-3-methyl-, 3H-Pyrazol-3-one, 2,4-dihydro-2-(4-((2-hydroxyethyl)sulfonyl)phenyl)-5-methyl-, EINECS 244-678-8, VINYLSULPHONE-PARAZONOLEBASE

2,4-dihydro-2-[4-[(2-hydroxyethyl)sulfonyl]phenyl]-5-methyl-3H-pyrazol-3-one (CAS 21951-34-8) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C12H14N2O4S and a molecular weight of 282.31600 g/mol. It is also known as 1-(4-beta-hydroxyethylsulfonylphenyl-)3-methyl-5-pyrazolone, 1-(4-beta-hydroxyethylsulfonylphenyl-)-3-methyl-5-pyrazolone(oxethylsulfonepyrazolone) and 1-[4-(2-hydroxyethylsulfonyl)phenyl]-3-methyl-2-pyrazolin-5-one. Key properties include a boiling point of 584.9ºC at 760 mmHg, a density of 1.42 g/cm3 and a flash point of 307.6ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.

21951-34-8

Jingsj CID

J-1361303-7

Molecular Formula

C₁₂H₁₄N₂O₄S

Chinese Name

2,4-二氢-2-[4-[(2-羟基乙基)磺酰基]苯基]-5-甲基-3H-吡唑-3-酮

Molecular Weight

282.31600 g/mol

Category

Pharma Intermediates

Last updated

8/21/2026