Barium compounds preparation

During this reaction, some barium ions remain in the solution as chlorides and can be uti1i2ed for the preparation of other barium compounds. 

Most barium compounds are prepared from reactions of barium carbonate [513-77-9] BaCO, which is commercially manufactured by the "black ash" process from barite and coke ki a process identical to that for strontium carbonate production. Depending on the co-product, soda ash and/or carbon dioxide are also consumed. 

Nothing is known on the structures of barium compounds like BaAgFs and BaNiFs prepared by Hoppe (153, 155). 

G. Taddei7 prepared potassium iodide by adding a dil. soln. of potassium monosulphide to an alcoholic soln. of iodine. In place pf potassium sulphide, J. von Liebig and C. Wittstock used barium sulphide, prepared by calcining sulphate with coke. According to R. Schindler, the products obtained by the sulphide process are contaminated with sulphur compounds. G. S. Serullas treated potassium antimoniate (prepared by calcining tartar emetic) with an alcoholic soln. of iodine as long as the soln. was decolorized. The filtered soln. was evaporated to the point of crystallization. 

Diacyl dirhodium(III) compounds, preparation, 7, 165 Dialkenyl compounds, calcium, strontium, barium, 2, 120 Dialkoxo ligands... 

Preparation.—Several methods6 have been employed to isolate metallic lithium from its salts. The silicates yield lithium oxide, carbonate, or sulphate by ignition with the corresponding calcium or barium compound.6 The solution obtained by extraction with water is freed from heavy metals by precipitation, and the lithium and other alkali-metal salts present converted into carbonates.7 The methods employed in the separation of the mixed carbonates depend on the comparative insolubility of lithium carbonate in water, and on the... 

The barium bis(dnunod) complex is readily prepared by a redox reaction combining elemental barium with Hdnunod (equation 43). Purified by distillation of the excess Hdnunod, Ba(dmmod)2 was identified to be authentic by elemental analysis, and found to be monomeric in benzene solution. Examination of the literature reports currently available indicates that this represents the first observation of an ambient condition liquid barium compound that is based on )3-diketonate ligands. Utihzing the data, it would appear that the metal center is six coordinate. Examination of space-filling molecular models lends some credence to this suggestion. 

Allylic barium reagents prepared in this way can realize highly a-selective reactions with different electrophiles, e.g. cross-coupling reactions with allylic halides or allylic phosphates, additions to carbonyl compounds or imines, and ring opening of epoxides. A selective Michael addition reaction with an a,/ -unsaturated cy-cloalkanone can also be performed by use of an allylic barium reagent. 

Three different monolith samples were prepared according to a procedure described elsewhere [5] the first with 160 mg alumina, 40 mg barium oxide, 4.0 mg Pt and 2.0 mg Rh, the second with 160 mg alumina and 40 mg barium oxide and the third with 200 mg alumina, 4.0 mg Pt and 2.0 mg Rh. We do not know the exact nature of the barium compound in the catalyst but refer to it as BaO in this paper. The fresh catalysts were reduced in H2 at 450°C for 35 minutes and stabilised in the lean gas mixture (see Table 1) at 550°C for two hours. 

Barium polysuliide (BaS SJ can easily be mixed with cold water. Its solid preparation contains BaS and elemental sulfur. Barium compounds are strong poisons relevant precautionary measures must be observed, when they are handled. 

Barium distearate EINECS 229-966-3 Stavinor 40 Stearic acid, barium salt Synpro Barium Stearate. Waterproofing agent lubricant in metalworking, plastics, and rubber wax compounding preparation of greases heat and light stabilizer in plastics. Used as a processing aid, lubricant for PVC, polyolefins, PS, ABS, Adeka Fine Chem. CK Witco Corp. Syn Prods. 

Very little is yet known about the physical properties of organo-calcium, -strontium, or -barium compounds. The preparation and properties of organic derivatives of the Second Group have been reviewed by Baluyeva and Ioffe89 and by Ioffe and Nesmeyanov.90... 

Strontium salts react similarly to barium salts with sodium rhodizonate. However, strontium rhodizonate is easily soluble in dilute hydrochloric acid in the cold, whereas the barium compound is converted into an insoluble bright red acid salt. It must be noted that small amounts of barium rhodizonate prepared in a test tube in neutral solution, and then treated with hydrochloric acid, seem to dissolve, because the red barium salt is formed in a fine state of division and is hard to see. If, however, the reaction is carried out on paper, the brown-red stain of barium rhodizonate is turned to a... 

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