1-(3-Chlorophenyl)-3-methyl-5-pyrazolone

1-(3-氯苯基)-3-甲基-5-吡唑啉酮

Also known as: 1-(3-Chlorophenyl)-3-methyl-2-pyrazolin-5-one, 2-(3-chlorophenyl)-2,4-dihydro-5-methyl-3H-pyrazol-3-one, 3-methyl-1-(3-chlorophenyl)-2-pyrazolin-5-one, MCPMP, m-Chloropyrazolone, 1-(3-Chlorophenyl)-4,5-dihydro-3-methyl-1H-pyrazol-5-one, 2-(3-chlorophenyl)-5-methyl-4H-pyrazol-3-one

1-(3-Chlorophenyl)-3-methyl-5-pyrazolone (CAS 90-31-3) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C10H9ClN2O and a molecular weight of 208.64400 g/mol. It is also known as 1-(3-Chlorophenyl)-3-methyl-2-pyrazolin-5-one, 2-(3-chlorophenyl)-2,4-dihydro-5-methyl-3H-pyrazol-3-one and 3-methyl-1-(3-chlorophenyl)-2-pyrazolin-5-one. Key properties include a melting point of 128-131ºC, a boiling point of 382.9ºC at 760 mmHg, a density of 1.32g/cm3 and a flash point of 185.4ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.

90-31-3

Jingsj CID

J-37202-4

Molecular Formula

C₁₀H₉ClN₂O

Chinese Name

1-(3-氯苯基)-3-甲基-5-吡唑啉酮

Molecular Weight

208.64400 g/mol

Category

Pharma Intermediates

Last updated

8/21/2026