2-(3,4-Dimethylphenyl)-1,2-dihydro-5-methyl-3H-pyrazol-3-one

2-(3,4-二甲基苯基)-1,2-二氢-5-甲基-3H-吡唑-3-酮

Also known as: 2-(3,4-Dimethylphenyl)-5-methyl-1,2-dihydro-3H-pyrazol-3-one, 2-(3,4-Dimethylphenyl)-5-methyl-1H-pyrazol-3(2H)-one, 1-(3,4-Dimethylphenyl)-3-methyl-1H-pyrazol-5-ol, 1-(3,4-Dimethylphenyl)-3-methyl-3-pyrazolin-5-one, 3-methyl-1-(3,4-dimethylphenyl)-2-pyrazolin-5-one, Eltrombopag Intermediate 1, Eltrombopag II, Eltrombopag Impurity 35

2-(3,4-Dimethylphenyl)-1,2-dihydro-5-methyl-3H-pyrazol-3-one (CAS 277299-70-4) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C12H14N2O and a molecular weight of 202.252 g/mol. It is also known as 2-(3,4-Dimethylphenyl)-5-methyl-1,2-dihydro-3H-pyrazol-3-one, 2-(3,4-Dimethylphenyl)-5-methyl-1H-pyrazol-3(2H)-one and 1-(3,4-Dimethylphenyl)-3-methyl-1H-pyrazol-5-ol. Key properties include a melting point of 121.0 to 125.0 °C, a boiling point of 338.5±52.0 °C at 760 mmHg, a density of 1.1±0.1 g/cm3 and a flash point of 158.5±30.7 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.

277299-70-4

Jingsj CID

J-1122359-3

Molecular Formula

C₁₂H₁₄N₂O

Chinese Name

2-(3,4-二甲基苯基)-1,2-二氢-5-甲基-3H-吡唑-3-酮

Molecular Weight

202.252 g/mol

Category

Pharma Intermediates

Last updated

8/21/2026