79-40-3 Usage
Uses
Different sources of media describe the Uses of 79-40-3 differently. You can refer to the following data:
1. As a reagent for copper, cobalt, and nickel. As a stabilizer of ascorbic acid solutions: Smoczkiewicz, Grochmalicka, Nature 192, 16 (1961).
2. Rubeanic acid may be used for the quantitative precipitation of copper, nickel
and cobalt. The copper complex is dark green, the cobalt brownish-red and the
nickel violet. All these complexes are chelates of outstanding stability, and this,
together with their vivid Colours, affords the reaction great analytical sensitivity.
The copper complex is the most stable of the three; it can be precipitated even
from mild mineral acidic solution, while precipitation of the corresponding cobalt
and nickel complexes requires buffered media. On the other hand, palladium,
platinum and silver react with rubeanic acid to give precipitates in strongly acidic
solution. It should be mentioned, however, that in the case of platinum and
some other metals (zinc, cadmium, silver, lead, mercury) the product is the corresponding
sulfide rather than the rubeanate complex.
Rubeanic acid reacts with ruthenium to give a blue water-soluble complex ion,
which is utilized for the spectrophotometric determination of ruthenium.
Rubeanic acid has similarly been used for the spectrophotometric determination
of osmium.
It has also proved suitable for the solvent extraction separation and determination
of thallium. It has been found that thallium exists in the organic phase
in the form of a complex of composition Tl/dto/Hdto, where dto represents the
rubeanate anion with one negative charge.
3. Dithiooxamide acts as a chelating agent and used in the determination of copper(II), nickel(II) and cobalt(II). It is used as a building block in the synthesis of cyclen. It is involved in the preparation of thiazolothiazole-linked porous organic polymers and N,N'-disubstituted dithiooxamides. It is also employed as a modifier to prepare the modified glassy carbon electrode which is used to investigate the electrochemical properties of quercetin, an important flavonoid derivative. Further, it is involved in the preparation of chelating resin with formaldehyde, which finds application in separation and concentration of silver ions.
General Description
Dithiooxamide is reported to form complexes with Ni(II).
Safety Profile
Poison by ingestion,
intraperitoneal, and intravenous routes.
When heated to decomposition it emits very
toxic fumes of NOx and SOx
Purification Methods
Crystallise dithiooxamide from EtOH and sublime it at high vacuum. [Beilstein 2 IV 1871.]
Check Digit Verification of cas no
The CAS Registry Mumber 79-40-3 includes 5 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 2 digits, 7 and 9 respectively; the second part has 2 digits, 4 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 79-40:
(4*7)+(3*9)+(2*4)+(1*0)=63
63 % 10 = 3
So 79-40-3 is a valid CAS Registry Number.
InChI:InChI=1/C2H4N2S2/c3-1(5)2(4)6/h(H2,3,5)(H2,4,6)
79-40-3Relevant articles and documents
Studies on reactions of Lawesson's reagent with phenylthiourea and oxamide
He, Liang-Nian,Huang, Tian-Bao,Cai, Fei,Chen, Ru-Yu
, p. 147 - 153 (1998)
Lawesson's reagent reacted with phenylthiourea in toluene at 110°C to give a product of ring-opening (2) instead of a 4-membered ring 2a. Its structure was determined by X-ray diffraction analysis. A mechanism is proposed to explain the formation of compound 2. The O-S exchange reaction of Lawesson's reagent with oxamide in acetonitrile was also investigated.
THE REACTION OF NITROACETAMIDES WITH THIONATION REAGENTS SYNTHESIS OF MONO- AND DITHIO- OXALIC ACID DIAMIDES
Harris, Philip A.,Jackson, Arthur,Joule, John A.
, p. 3189 - 3192 (2007/10/02)
Nitroacetamides, R1(R2)N.CO.CH2NO2, react with phosphorus sulphide (P4S10) or 2,4-bis(4-methoxyphenyl)-1,2-dithiadiphosphetane-2,4-disulphide, Lawesson's reagent, to give amidethioamides, R1(R2)N.CO.CS.NH2.
