PICROLONIC ACID Chemical Properties

Melting point:

119 °C

Boiling point:

548.8±50.0 °C(Predicted)

Density 

1.65±0.1 g/cm3(Predicted)

storage temp. 

Sealed in dry,2-8°C

solubility 

0.27 % in water at room temperature, readily soluble in alcohol.

form 

Yellow crystalline material. Melting point 116-120°C (with decomposition).

pka

2.44±0.40(Predicted)

Water Solubility 

Slightly soluble in water. Soluble in alcohol.

Merck 

14,7412

BRN 

623723

CAS DataBase Reference

550-74-3(CAS DataBase Reference)

EPA Substance Registry System

Picrolonic acid (550-74-3)

Safety Information

Hazard Codes 

Xn,Xi

Risk Statements 

68-36/37/38-22-36/38-7

Safety Statements 

37/39-26-36

RIDADR 

3224

RTECS 

UQ9510000

TSCA 

Yes

HS Code 

29339900

MSDS

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PICROLONIC ACID Usage And Synthesis

Chemical Properties

beige to ochre-yellow powder

Uses

With calcium(II), lead(II) and thorium(IV) the reagent gives complexes which are practically insoluble in water. The high molecular weight crystalline complexes can be used to advantage for the accurate determination of minute amounts of various metals.
The reagent has also proved suitable for the spectrophotometric determination of calcium. Calcium picrolonate is transformed by bromine water in alkaline medium to a red, water-soluble complex. The absorption of this compound is constant for about two days and it also follows the Beer-Lambert Law.

Uses

Reagent for the isolation of amines as crystalline π-complexes.Picrolonic acid is an analytical reagent used for the estimation of calcium, magnesium, lead, strontium and thorium. It is also used for the analysis of alkaloids, tryptophan and phenylalanine.

Uses

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

Purification Methods

Crystallise picrolic acid from water or EtOH (solubility is 0.123% at 15o and 1.203% at 100o in H2O; and 1.107% at 0o and 11.68% at 81o in EtOH). It forms Ca, Cu Hg, Mg, Na, Sr, Pb and many other metal complexes [Maquestian et al Bull Soc Chim Belg 82 233 1973, Isaki et al. Chem Ber 74 1420 1941]. [Beilstein 24 H 51, 24 I 218, 24 II 25, 22 III/IV 105.]

PICROLONIC ACID(550-74-3)Related Product Information

• 2-PYRAZOLINE
• Picrolonic acid potassium salt
• Picrolonic acid sodium salt
• calcium picrolonate
• AKOS 239-08
• AKOS 245-51
• PICROLONIC ACID
• AKOS 244-62
• AKOS 244-35