1-(2,5-Dichloro-4-sulfophenyl)-3-methyl-5-pyrazolone

1-(2,5-二氯-4-磺酸苯基)-3-甲基-5-吡唑啉酮

Also known as: Dichlorosulfophenyl-3-methylpyrazolone, 1-(2,5-Dichloro-4-sulfophenyl)-3-methyl-5(4H)-pyrazolone, 1-(2,5-Dichloro-4-sulfophenyl)-3-methyl-2-pyrazolin-5-one, 1-(2,5-Dichloro-4-sulfophenyl)-3-methyl-5-pyrazolone Monohydrate, 2,5-dichloro-4-(3-methyl-5-oxo-2-pyrazolin-1-yl)-benzenesulfonic acid, 2,5-dichloro-4-(4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)-benzenesulfonic acid, EINECS 201-541-7, MFCD00035706

1-(2,5-Dichloro-4-sulfophenyl)-3-methyl-5-pyrazolone (CAS 84-57-1) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C10H8Cl2N2O4S and a molecular weight of 323.15300 g/mol. It is also known as Dichlorosulfophenyl-3-methylpyrazolone, 1-(2,5-Dichloro-4-sulfophenyl)-3-methyl-5(4H)-pyrazolone and 1-(2,5-Dichloro-4-sulfophenyl)-3-methyl-2-pyrazolin-5-one. Key properties include a melting point of 346 °C (dec.)(lit.) and a boiling point of 221ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.

84-57-1

Jingsj CID

J-1361707-5

Molecular Formula

C₁₀H₈Cl₂N₂O₄S

Chinese Name

1-(2,5-二氯-4-磺酸苯基)-3-甲基-5-吡唑啉酮

Molecular Weight

323.15300 g/mol

Category

Pharma Intermediates

Last updated

8/21/2026