7412. Picrolonic Acid

Nomenclature

CAS number: 550-74-3
2,4-Dihydro-5-methyl-4-nitro-2-(4-nitrophenyl)-3H-pyrazol-3-one; 3-methyl-4-nitro-1-(p-nitrophenyl)-2-pyrazolin-5-one.
C10H8N4O5; mol wt 264.19.
C 45.46%, H 3.05%, N 21.21%, O 30.28%.
Chemical structure

Properties

Yellow leaflets, mp 116-117°; dec at 125°. Sparingly sol in water; sol in alcohol.

Use

As reagent for alkaloids, tryptophan, phenylalanine, and for the detection and estimation of calcium.