550-74-3 Usage
Chemical Properties
beige to ochre-yellow powder
Uses
Different sources of media describe the Uses of 550-74-3 differently. You can refer to the following data:
1. As reagent for alkaloids, tryptophan, phenylalanine, and for the detection and estimation of calcium.
2. 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.
3. 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.
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.]
Check Digit Verification of cas no
The CAS Registry Mumber 550-74-3 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 5,5 and 0 respectively; the second part has 2 digits, 7 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 550-74:
(5*5)+(4*5)+(3*0)+(2*7)+(1*4)=63
63 % 10 = 3
So 550-74-3 is a valid CAS Registry Number.
InChI:InChI=1/C10H8N4O5/c1-6-9(14(18)19)10(15)12(11-6)7-2-4-8(5-3-7)13(16)17/h2-5,9H,1H3/t9-/m1/s1