1-methyl-3-(trifluoromethyl)-1H-pyrazol-5(4H)-one

1-甲基-3-(三氟甲基)-1H-吡唑-5(4H)-酮

Also known as: 1-methyl-3-(trifluoromethyl)-4,5-dihydro-1H-pyrazol-5-one, 1-methyl-3-trifluoromethyl-2-pyrazolin-5-one, 2-methyl-5-(trifluoromethyl)-2,4-dihydro-3H-pyrazol-3-one, 3-trifluoromethyl-1-methyl-1H-5-pyrazolone

1-methyl-3-(trifluoromethyl)-1H-pyrazol-5(4H)-one (CAS 1481-02-3) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C5H5F3N2O and a molecular weight of 166.10100 g/mol. It is also known as 1-methyl-3-(trifluoromethyl)-4,5-dihydro-1H-pyrazol-5-one, 1-methyl-3-trifluoromethyl-2-pyrazolin-5-one and 2-methyl-5-(trifluoromethyl)-2,4-dihydro-3H-pyrazol-3-one. Key properties include a melting point of 178 °C, a boiling point of 101.6ºC at 760 mmHg, a density of 1.5 g/cm3 and a flash point of 15.3ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.

1481-02-3

Jingsj CID

J-24775-5

Molecular Formula

C₅H₅F₃N₂O

Chinese Name

1-甲基-3-(三氟甲基)-1H-吡唑-5(4H)-酮

Molecular Weight

166.10100 g/mol

Category

Pharma Intermediates

Last updated

8/21/2026