Barium disulfide

Barium also forms several other sulfides. Among them are Barium hydrosulfide, Ba(SH)2 [25417-81-6] Barium disulfide, BaS2 [12230-99-8] Diharium trifulfide, Ba2Ss [53111-28-7] Barium trisulfide, BaSs [12231-01-5] Barium tetrasulfide monohydrate, BaS4 H20 [12248-67-8] Barium pentasulfide, BaSs [12448—68—9]. 

Quantitatively, sulfur in a free or combined state is generally determined by oxidizing it to a soluble sulfate, by fusion with an alkaH carbonate if necessary, and precipitating it as insoluble barium sulfate. Oxidation can be effected with such agents as concentrated or fuming nitric acid, bromine, sodium peroxide, potassium nitrate, or potassium chlorate. Free sulfur is normally determined by solution in carbon disulfide, the latter being distilled from the extract. This method is not useful if the sample contains polymeric sulfur. 

Dinitro-o-phthalic Acid. Prisms from eth. mp 225—6°. Very sol in w, ale. eth insol in llgr, C disulfide and benz. Can be prepd by the oxidation of 5,7-dinitro-l,2,3,4-tetrahydro-naphthalene with 30% boiling nitric acid or by other methods given in the Refs. The barium salt, Cg H2 (N02)2 04. Ba is expl... 

Antimony trisulfide, carbon disulfide vapour, chromium(II) sulfide and hydrogen sulfide all ignite in contact with fluorine at ambient temperature, the solids becoming incandescent [1]. Iron(II) sulfide reacts violently on mild warming, and barium sulfide, potassium sulfide or zinc sulfide all incandesce in the gas, as does molybdenum(III) sulfide at 200°C [2],... 

Mixtures of potassium nitrate with antimony trisulfide [1], barium sulfide, calcium sulfide, germanium monosulfide or titanium disulfide all explode on heating [2]. The mixture with arsenic disulfide is detonable, and addition of sulfur gives a pyrotechnic composition [2], Mixtures with molybdenum disulfide are also detonable [3], Interaction with sulfides in molten mixtures is violent [4],... 

MRH Barium chlorate 5.06/83, calcium chlorate 5.61/77, potassium chlorate 6.07/76, sodium bromate 4.98/80, sodium chlorate 7.32/75, zinc chlorate 6.11/76 Dry finely divided mixtures of red (or white) phosphorus with chlorates, bromates or iodates of barium, calcium, magnesium, potassium, sodium or zinc will readily explode on initiation by friction, impact or heat. Fires have been caused by accidental contact in the pocket between the red phosphorus in the friction strip on safety-match boxes and potassium chlorate tablets. Addition of a little water to a mixture of white or red phosphorus and potassium iodate causes a violent or explosive reaction. Addition of a little of a solution of phosphorus in carbon disulfide to potassium chlorate causes an explosion when the solvent evaporates. The extreme danger of mixtures of red phosphorus (or sulfur) with chlorates was recognised in the UK some 50 years ago when unlicenced preparation of such mixtures was prohibited by Orders in Council. 

Rhodococcus strain SY1 was reported to desulfurize dimethyl sulfide, dimethyl sulfoxide, and several alkyl sulfonates [41] in addition to DBT [78], Barium chloride has been used to precipitate sulfate and shown to alleviate sulfate repression partially. The authors proposed a tentative pathway for oxidative removal of sulfur from DBT and other organosulfur compounds. It should be noted that phenyl disulfide and thianaph-thene were not desulfurized by any of the Rhodococcus strains, but have been reported to be substrates of Gordonia CYKS2. 

Thiols, sulfoxides, sulfones, disulfides,407 and other sulfur compounds can be oxidized to sulfonic acids with many oxidizing agents, though for synthetic purposes the reaction is most important for thiols.408 Among oxidizing agents used are boiling nitric acid and barium... 

The barium salt is easier to obtain in solid form than is the corresponding potassium salt. Dissolve 15 g. of crystallized barium hydroxide in 50 cc. of warm water and divide the solution into two equal parts. Completely saturate the one portion (in a stoppered flask) with hydrogen sulfide and then add the other portion, thus forming a solution of barium sulfide. Add about 1 cc. of carbon disulfide and shake from time to time. It is better to add the carbon disulfide by conducting a current of coal gas (from the laboratory gas supply) through a little carbon disulfide in a wash flask and thence into the solution of barium sulfide. The barium salt precipitates as a yellow crystalline powder. The filtered precipitate should be washed first with water, then with half alcohol, finally with pure alcohol and dried on a hot plate. A second crop of crystals may be obtained by allowing the wash alcohol to drain into the mother liquor. 

Sodium, potassium, barium, or calcium thiocyanate may be made by reaction of sulfur and the corresponding cyanide by heating to fusion. Ammonium thiocyanate (plus ammonium sulfide) may be made by reaction of ammonia and carbon disulfide, a reaction which probably accounts for tlie presence of ammonium thiocyanate in the products of the destructive distillation of coal. This reaction corresponds to the formation of ammonium evanate from ammonia and carbon dioxide. 

Keywords thiol, oxidative coupling, active manganese dioxide, barium manga-nate, disulfide... 

Interest in the xanthates of carbohydrates has arisen almost entirely through the importance of the viscose process in the technical production of rayon and related products.126 The selective character of the reaction of carbon disulfide and alkali with polyhydroxy compounds has been studied. Lieser and Nagel126 found that a monoxanthate is formed with polyhydric alcohols and methyl a-D-glucopyranoside when they react with carbon disulfide and aqueous barium hydroxide. The xanthation that has been demonstrated in the cases of glycerol 1,3-dimethyl ether and levoglucosan (LXIX) shows that secondary hydroxyl groups can... 

Mixtures of potassium nitrate with antimony trisulfide [1], barium sulfide, calcium sulfide, germanium monosulfide or titanium disulfide all explode on heating [2]. The... 

Ammonium hexacyanoferrate(II), 2572 f Arsine, 0100 Azido-2-butyne, 1469 3-Azidopropyne, 1111 cis-Azobenzene, 3478 Azoxybenzene, 3479 Barium azide, 0214 Benzenediazonium nitrate, 2268 Benzotriazole, 2262 Borane, 0135 Bromine azide, 0256 f 3-Bromopropyne, 1087 f 1,2-Butadiene, 1475 f 1,3-Butadiene, 1476 f Buten-3-yne, 1419 f 1-Butyne, 1477 f 2-Butyne, 1478 Cadmium azide, 3951 Cadmium cyanide, 0585 Cadmium fulminate, 0586 Cadmium nitride, 3954 Calcium azide, 3930 t Carbon disulfide, 0557 Chlorine dioxide, 4036 Chloroacetylene, 0648... 

Metal Sulfides. Mixtures with antimony trisulfide, barium or calcium sulfides, or germanium monosulfide or titanium disulfide explode on heating4-6 mixtures with arsenic disulfide6 or molybdenum disulfide7 are detonatable. 

Tribochemical reactions of dibenzyl disulfide in the presence of a second additive (e.g., ZDDP, chlorinated paraffin, amines, phenol, barium alkylbenzylsulfonate, and polyisobutenylsuccinimide) were investigated (Plaza, 1989). All the systems tested reduced the concentration of elemental sulfur in the oil to low loads. Formation of FeS was reduced in the presence of chlorinated paraffin, barium alkylbenzylsulfonate, ZDDP, and polyisobutenylsuccinimide. The amines and hindered phenol had little or no effect on iron sulfide formation at higher loads. 

OxidationThis reagent is similar to barium manganate. It also couples aromatic amines to azo compounds in moderate yield and converts thiols to disulfides in 85-100% yield. 

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