Bases barium compounds

In a related reaction, primary aromatic amines have been oxidized to azo compounds by a variety of oxidizing agents, among them Mn02, lead tetraacetate, O2 and a base, barium permanganate, and sodium perborate in acetic acid, tert Butyl hydroperoxide has been used to oxidize certain primary amines to azoxy compounds. 

Similar products were obtained from metallic silver and from barium chloride (Table 1), though the residues- from the fluorides of other electropositive elements did not show a stoichiometric composition. This apparent anomaly may be explained by supposing that, in general, bases containing the (BrF )- anion are less stable than the acids, and that a number of compounds of this type lose bromine trifluoride at room temperature. The potassium, silver and barium compounds are... 

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Two-component primer compositions (based on lead and barium compounds) are more common than three-component types (based on lead, barium, and antimony compounds) in rimfire primed ammunition. However,... 

The primary amides of the group 2 elements, M(NH2)2, are nonmolecular species. " When the NH2 ligand is replaced by the bulky bis(trimethylsilyl)amido group, however, molecular complexes are formed. A complete set of structures has been obtained for Be through Ba (Table 11). The barium bis(trimethylsilyl)amides form a progression of compounds that illustrate the important relationship between ligand bulk and metal nuclearity. The base-free compound, [Ba N(SiMe3)2 ]2, exists as a dimer that can accommodate... 

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. 

The DHAP aldolases are quite specific for the phosphorylated nucleophile 41, tvhich must therefore be prepared independently or generated in situ (cf. Section 5.4.4). Initial aldol products tvill thus contain a phosphate ester moiety, vhich facilitates product isolation, for example by barium salt precipitation or by use of ion-exchange techniques. The corresponding phosphate free compounds can be easily obtained by mild enzymatic hydrolysis using an inexpensive alkaline phosphatase at pH 8-9 [148], vhereas base-labile compounds might require vorking at pH 5-6 using a more expensive acid phosphatase [149]. 

The a-thiocyanatoketones are easily obtainable from a-halocarbonyl compounds and metal thiocyanates (sodium, potassium, barium, or lead thiocyanate) (416, 484, 519, 659) in an alcoholic solution. Yields ranged from 80 to 95%. They are very sensitive substances that isomerize when reacted upon by acids, bases, or labile hydrogen and sulfur compounds. 

Tetrahydrofurfuryl alcohol reacts with ammonia to give a variety of nitrogen containing compounds depending on the conditions employed. Over a barium hydroxide-promoted skeletal nickel—aluminum catalyst, 2-tetrahydrofurfur5iarnine [4795-29-3] is produced (113—115). With paHadium on alumina catalyst in the vapor phase (250—300°C), pyridine [110-86-1] is the principal product (116—117) pyridine also is formed using Zn and Cr based catalysts (118,119). At low pressure and 200°C over a reduced nickel catalyst, piperidine is obtained in good yield (120,121). 

These rosin-based sizes, whether paste, Hquid, or emulsions, can be used to size all grades of paper that are produced at acid pH. The latter include bleached or unbleached kraft Hnerboard and bag paper, bleached printing and writing grades, and cylinder board. In addition, polyaluminum compounds have been used in place of alum, most notably, polyaluminum chloride (48), which can reduce barium deposits where these have been a problem. The barium chloride by-product is more water-soluble than barium sulfate. Other polyaluminum compounds such as polyhydroxylated forms of alum and polyaluminum siHcosulfate have been evaluated as alum replacements. 

Organophosphoms compounds, primarily phosphonic acids, are used as sequestrants, scale inhibitors, deflocculants, or ion-control agents in oil wells, cooling-tower waters, and boiler-feed waters. Organophosphates are also used as plasticizers and flame retardants in plastics and elastomers, which accounted for 22% of PCl consumed. Phosphites, in conjunction with Hquid mixed metals, such as calcium—zinc and barium—cadmium heat stabilizers, function as antioxidants and stabilizer adjutants. In 1992, such phosphoms-based chemicals amounted to slightly more than 6% of all such plastic additives and represented 8500 t of phosphoms. Because PVC production is expected to increase, the use of phosphoms additive should increase 3% aimually through 1999. 

Spkit Blue [2152-64-9] Cl Solvent Blue 23 (Cl 42760), is one of the few dyes sulfonated as the leuco base. The degree of sulfonation depends on the conditions. Monosulfonated derivatives, commonly referred to as alkaU blues, eg. Cl Acid Blue 119 [1324-76-17, are used as thek barium or calcium salts in printing inks. Disulfonated compounds, eg. Cl Acid Blue 48 [1324-77-2] are employed as thek sodium or ammonium salts for blueing paper, whereas the trisulfonic derivatives or ink blues, eg. Cl Acid Blue 93 [28983-56A] are used in writing inks (qv). 

Antimony tris(isooctylthioglycolate) has found use in pipe formulations at low levels. Its disadvantage is that it cross-stains with sulfide-based tin stabilizers (122). Barium—zinc stabilizers have found use in plasticized compounds, replacing barium—cadmium stabilizers. These are used in mol dings, profiles, and wire coatings. Cadmium use has decreased because of environmental concerns surrounding certain heavy metals. 

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