Rubeanic acid

In the reverse reaction, thioheteroaryl amides reacted under reflux in alcohol with haloketones or aldehydes to give the corresponding 2-heteroarylthiazole derivatives (238, 271, 482, 550, 751, 765, 776, 781). 2,2 -Bithiazoles (4,4 -disubstituted) have been obtained in 80 to 90% yield by cyclocondensation of 1 mole rubeanic acid with 2 moles of a-bromoketones in polyphosphoric acid at 95 to 135 C (780). Some multiheteroaryl substituted thiazoles have been also reported (704). 

Dithiooxamide (rubeanic acid) [79-40-3] M 120.2, m >300 . Crystd from EtOH and sublimed in a vacuum. 

Roseocobalt — see Cobalt, aquapentaammine-Roseopentaammine —see Aquapentaammine Roussin s black, 4, 1191 Roussin s red, 4, 1191 Roussin s salts, 4,240, 1243 Rubber vulcanization zinc complexes in, 5, 998 Rubeanic acid — see Dithiooxamid Rubidium complexes... 

In addition to stabilizing organic products by reaction with metal-exchanged clays, as indicated above, aluminosilicate minerals may enable the preparation of metal organic complexes that cannot be formed in solution. Thus a complex of Cu(II) with rubeanic acid (dithiooxamide) could be prepared by soaking Cu montmorillonite in an acetone solution of rubeanic acid (93). The intercalated complex was monomeric, aligned with Its molecular plane parallel to the interlamellar surfaces, and had a metal ligand ratio of 1 2 despite the tetradentate nature of the rubeanic acid. 

Rubeanic acid, complexes of, 3 277 Rubidium acetylide, 11 195 anion, 25 165-166 electron photodetachment, 25 166 optical spectra, 25 166 auride, 25 241 borates, 25 215 structures, 25 194 carbide, 11 195... 

Readily accessible aryliminodithiazoles 56 can be converted by LiAlH4 reduction into the rearranged A-aryl-dithiooxamides 112 (Equation 24) <1999S1345>. Although the yields are moderate (35—42%), this reaction provides a convenient two-step synthesis of unsymmetrical rubeanic acid derivatives from arylamines. 

The reagent consists of ail 0-5 per cent solution of rubeanic acid in alcohol. 

Rubeanic acid reagent (CS. NH2) 2 blue or violet precipitate or colouration in ammoniacal solution. Copper and cobalt, as well as iron salts interfere with the reaction and should be absent. 

Group IIIB. Ni, Co, Mn, and Zn The metals are present as chlorides in dilute hydrochloric acid. The solvent used is acetone containing 5 per cent (v/v) water and 8 per cent (v/v) hydrochloric acid (d 1.18). The separation is conducted in an atmosphere saturated with respect to the solvent. The strip is dried (after a solvent movement of about 25 cm), exposed to ammonia vapour, and then sprayed with a saturated alcoholic solution of alizarin containing 0-1 per cent rubeanic acid and 1 per cent salicyladoxime. The following results are obtained (cf. also Fig. VI.5b). 

Alizarin-rubeanic acid-salicylaldoxime reagent (for paper chromatography). Dissolve 20g alizarin, C14H804, 0-1 g rubeanic acid, NH2.CS.CS.NH2, and 1 g salicylaldoxime, C6H4CH(NOH)OH, in 100 ml of 96% ethanol. 

Rubeanic acid (0-5%). Dissolve 0-5 g rubeanic acid [or dithio-oxamide] NH2, CS.CS.NH2 in 95 per cent ethanol and dilute the solvent to 100 ml. The solution decomposes rapidly and should be prepared freshly each time. 

Rubeanic acid (0 02%). Dissolve 20 mg rubeanic acid (dithio-oxamide), NH2.CS.CS.NH2, in 100 ml glacial acetic acid. The reagent should be prepared freshly. 

Scheme 1 represents the synthesis of a linear coordination polymer by use of bischeiating ligands such as rubeanic acid, bis-1,3-diketones, and bis-8-hydroxyquinolines which can be attached simultaneously to metal atoms or ions. Equation 6 describes a recent example of the coordination polymers which is prepared according to Scheme 113). This field of coordination polymers was developed from the large research program in USA during the Second World War in attempts to find thermally stable polymers. The activity in this field has been recently increased in the expecta-...

Mo03 is known to crystallize in a layer lattice in which two-dimensional metal oxide sheets are separated by a van der Waals gap. Son et al.20) prepared linear Ni(II)-rubeanic acid coordination polymer (23) in the interlayer space of Mo03. 

SYNS DITHIOOXALDIIMIDIC ACID DITHIOXAAHDE ETHANEDITHIOAAnDE HYDRORUBEANIC ACID RUBEANE RUBEANIC ACID RVK USAF EK-4394 USAF MK-6... 

Several of the studies of catalyzed redox reactions involve hydrogen peroxide oxidations of reducing agents such as thiosulfate, iodide, rubeanic acid, and methyl orange. Some substances that act as catalysts in acidic solution for the oxidation are Zr(IV), Hf(IV), Th(IV), Nb(V), Ta(V), Mo(VI), W(VI), Fe(III), Ti(IV), V(V), and... 

Cu, Cu, Ni, Fe TLC AI2O3, combination of ring-oven and circular chromat. Visual + rubeanic acid, + KSCN 5-10 ng 233)... 

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