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

4-[(2,4-二甲基苯基)偶氮]-2,4-二氢-5-甲基-2-苯基-3H-吡唑-3-酮

Also known as: Solvent Yellow 18, C.I. 12740, C.I. Food Yellow 12, Transparent yellow GR, Sudangelb G, 2-Phenyl-4-(2,4-dimethylphenylazo)-5-methyl-2H-pyrazole-3(4H)-one, 3H-Pyrazol-3-one, 4-[2-(2,4-dimethylphenyl)diazenyl]-2,4-dihydro-5-methyl-2-phenyl-, 4-(2',4'-Dimethylphenylazo)-3-methyl-1-phenylpyrazolin-5-on

4-[(2,4-Dimethylphenyl)azo]-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-one (CAS 6407-78-9) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C18H18N4O and a molecular weight of 306.36200 g/mol. It is also known as Solvent Yellow 18, C.I. 12740 and C.I. Food Yellow 12. Key properties include a boiling point of 497.8ºC at 760 mmHg, a density of 1.19 and a flash point of 254.8ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.

6407-78-9

Jingsj CID

J-1450676-9

Molecular Formula

C₁₈H₁₈N₄O

Chinese Name

4-[(2,4-二甲基苯基)偶氮]-2,4-二氢-5-甲基-2-苯基-3H-吡唑-3-酮

Molecular Weight

306.36200 g/mol

Category

Pharma Intermediates

Last updated

8/21/2026