Silver, oxidation with

Barium oxide and sodium hydride are more potent catalysts than silver oxide. With barium oxide catalysis, reactions occur more rapidly but O-acetyl migration is promoted. With sodiun hydride, even sterically hindered groups may be quantitatively alkylated but unwanted C-alkylation Instead of, or in addition to, 0-alkylatlon is a possibility. Sodium hydroxide is a suitable catalyst for the alkylation of carboxylic acids and alcohols [497J. 

Tripropylenediamino-chromic Iodide, [Cr pn3]X3.II20, may be prepared, for instance, by the decomposition of trichloro-tripyridino-ehromium with propylenediamine monohydrate. It crystallises in small yellow needles, soluble in water, and is decomposed by moist silver oxide with liberation of the base, [Cr pn3](OH)3. 

Silver foil is transformed by an aq. soln. of the trichloride into silver chloride and iodide silver oxide with an excess of the trichloride is transformed into the chloride and iodic acid with more silver oxide, silver iodate is formed and with an excess of the oxide and a boiling soln. some silver periodate is formed. Mercuric oxide is slowly transformed into mercuric chloride and oxide chlorine, oxygen, and possibly chlorine monoxide are evolved. Aq. soln. of the trichloride give a precipitate of iodine with a little stannous chloride with more stannous chloride, some stannous iodide is formed. Consequently, although chloroform extracts no iodine from the aq. soln., it will do so after the addition of stannous chloride. Sulphur dioxide and ferrous sulphate are oxidized. 

Silver forms several compounds or complexes with proteins by the action of silver oxide with gelatin in alkali solution, or with albumin, or by suspension in casein solution and by other methods, Such silver-protein complexes containing from 19 to 23% of silvei are known as mild silver protein and are used as antiseptic solutions. They are readily soluble in... 

In support of that explanation, X-ray analysis of the catalyst after use indicated the presence of MgO. Hence, the catalytically active phase was finely divided copper in intimate contact with magnesia, quasi as carrier. The same phenomenon was observed with the Zintl-phase alloys of silver and magnesium. Such catalysts were then deliberately prepared by coprecipitation of copper and silver oxides with magnesium hydroxide, followed by dehydration and reduction. Table I shows that these supported catalysts had the same activation energies as those formed by in situ decomposition of copper and silver alloys with magnesium. 

AgC2H302 (aq.). Berthelot9 reported a value for the heat of neutralization of silver oxide with aqueous acetic acid. 

Numerous conditions have been developed for this transformation, but reproducible yields have usually been obtained by mixing a silver salt with a coreagent, such as silver nitrate associated with wet ammonia, silver oxide with triethylamine or sodium thiosulfate, and silver benzoate with triethylamine. Nonbasic conditions have also been described by Koch and Podlech using silver trifluoroacetate deposited on silica.6 These modifications have been developed for the homologation of Fmoc-protected amino acids. 

Silver oxide with ammonia with ethanol... 

Determine the endpoint potentiometrically with a pH meter equipped with a standard glass electrode and a calomel electrode modified as follows Discard the aqueous potassium chloride solution contained in the electrode, rinse and fill with the supernatant liquid obtained by shaking thoroughly 2 g each of potassium chloride and silver chloride (or silver oxide) with 100 mL of methanol, then add a few crystals of potassium chloride and silver chloride (or silver oxide) to the electrode. 

The presence of water vapor with the alcohol vapor not only helps in controlling the reaction but is essential thereto since dry metallic oxides, or silver oxide, will not react with anhydrous acetaldehyde.82 Dry formaldehyde, on the other hand, reduces silver oxide with the formation of carbon monoxide. 

Chemical Properties of Dextrose.—The reactions of dextrose are in accord with the formula which has been assigned to it. It reacts as an aldehyde with an ammoniacal solution of silver oxide, with Fehling s solution, and with alkalies. An alkaline solution of dextrose precipitates selenium, tellurium, gold, platinum, and certain other metals from their salts. 

Manganese dioxide and pyrolusite apparently vary enormously depending upon the source and method of preparation. At least some preparations of manganese dioxide are very active in the absence of oil and water vapor. Mixtures of manganese dioxide and silver oxide with ratios varying from 6 4 to 6 1 are extremely active under the same conditions (18). 

The triflate can be prepared by reaction of silver oxide with trifluoromethane-sulfonic acid (987o yield).Protect from light. 

A metal with great affinity for iodine is silver. The importance of the reaction of metallic silver with iodine was first demonstrated in the LOFT FPT-2 test. Renewed attention to the reaction of molecular iodine with silver has arisen based on the results of the PHEBUS FPTO and FPTl tests in which silver-indium-cadmium control rod materials were released into the containment model of the test facility. Iodine appeared to react with this silver to form water-insoluble silver iodide (Agl). Precipitation of Agl appeared to control the behaviour of iodine in the containment model. Though details of the interactions of molecular iodine and iodide ion with metallic silver are still being investigated, it appears that silver in contact with water can be a very effective adsorber of iodine even at low values of pH. Deliberate addition of silver into containment sumps to augment any silver released to the containment by accident processes might be used to manage the iodine souree term. For silver to retain iodine, the surface must remain immersed in water. Silver iodide on a silver surface exposed to air is rapidly oxidised to form silver oxide with the release of moleeular iodine. Also, silver iodide may react widi sulphur compoimds in the atmosphere to form silver sulphide and release iodine. Finally, there is evidence that silver iodide is not stable to the beta radiation produeed by radioactive iodine. 

In other words, the charged ions stay together by electrostatic attraction and they are not separated by solvation. Iodide is not basic enough to remove the proton, so there is no opportunity for an acid-base reaction and subsequent elimination. The iodide ion must be changed to a basic ion. To accomplish this, treatment of 47 with silver oxide with a trace of water leads to tetraalkylam-monium hydroxide 42. This reaction exchanges the iodide ion for hydroxide ion, and when there is no solvent, the hydroxide remains with the ammonium ion via electrostatic attraction. 

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