Argentic oxide acids

PROP Brownish-black, heavy, odorless powder. Light sensitive. D 7.22 25°/4°. Decomp at approx 200°. Yery sol in dilute nitric acid, ammonia less sol in NaOH solns insol in ale. IDLH 10 mg/m (as Ag). SYNS ARGENTOUS OXIDE DISILVER OXIDE... 

Argentic oxide, AgO, which is prepared by the electrolysis of silver nitrate in nitric acid [379], converts aromatic methyl homologues into aldehydes [380], primary alcohols into aldehydes [380] or acids [381], aldehydes into acids [382], primary amines into aldehydes and nitriles [381], and phosphines into phosphine oxides [38i]. 

Methyl homologues of aromatic compounds are oxidized to aldehydes by silver(II) oxide (argentic oxide) [380], by ceric ammonium nitrate [238, 417, 422], by selenium dioxide [513, 514, 5i5], by chromyl chloride [477, 667], by periodic acid [760], and by manganese dioxide [1127] (equation 169). 

Both aliphatic and aromatic alcohols, as well a s unsaturated alcohols, are oxidized in the liquid phase with argentic oxide in nitric or acetic acid at temperatures from -10 through 60 °C [5S6]. 

Aldehydes are also oxidized to carboxylic acids in high yields by argentic oxide at room temperature in aqueous tetrahydrofuran. However,... 

A somewhat similar oxidation takes place when an aldehyde is treated with sodium cyanide and manganese dioxide or argentic oxide [382], The reaction is assumed to proceed through a cyanohydrin, which is oxidized to an a-keto nitrile. The a-keto nitrile in turn is converted into an acid (by argentic oxide in methanol) or an ester (by manganese dioxide in methanol). The method is especially suited for a, -unsaturated aldehydes [382] (equation 354). 

In conclusion, we can state that additions of small amounts of phosphoric acid increase the rate of Am (III) oxidation by Ag + ions without drastically changing the distribution coefficients of the species involved, because no complexation of Am occurs in these solutions, contrary to what occured in the extensive studies of Myassoeodov et al. (12, 13) in more concentrated phosphoric acid, where the kinetic effects must be attributed to changes in americium and silver (II) ionic species. In our Am-Cm separations we added phosphoric acid, which accelerates the oxidation rates of Am (III), solubilizes argentic oxide, and makes it possible to obtain Am (VI) quantitatively and rapidly at room temperature. 

Also heated with ammoniaod solution of argentic oxide, the aldehydea are converted into acids, metaliio silver being deposited —... 

ARGENTOUS OXIDE (20667-12-3) A strong oxidizer reacts with reducing agents, acids, amines, combustible materials. Reacts violently with ammonia. 

The use of silver (II) salts, particularly argentic picolinate, as reagents for hydroxyl oxidation has also been disclosed recently. The reaction may be run in acid, neutral or basic media in aqueous or polar organic solvents at room or slightly elevated temperatures. Primary alcohols may be oxidized to aldehydes or acids depending on the conditions used. Amines and trivalent phosphorous compounds are more sensitive to oxidation with this reagent than are hydroxyl groups. 

With metallio oxides, hydrates, and some sidts it forms iodides. Even argeurio chloride is transformed by hydriodle acid into argentic iodide —... 

Intramolecular electron transfer in a stepwise manner from the amine substrate to die silver(III) center in a 1 2 complex, [Ag(OH)4] -iV,/V-dimcthylanilinc, has been observed.44 The kinetics of oxidation of some aliphatic, heterocyclic, and aromatic aldehydes towards bis(dihydrogentellurato)cuprate(III) and argentate(III) in alkaline medium have been studied.45 A negative salt effect was observed in the oxidation of aminoacetic acid by diperiodatocuprate(III) complex in alkaline medium.46 The oxidation of glutamic acid by thallium(III) perchlorate is catalysed by Ru(M), Os(III), and Nd(III) in a free radical mechanism and the rate is inversely dependent on [H+] concentration.47... 

NITRATE d ARGENT (French) (7761-88-8) A powerful oxidizer. Forms friction- and shock-.sensitive compounds with many materials, including acetylene, anhydrous ammonia (produces compounds that are explosive when dry), 1,3-butadiyne, buten-3-yne, calcium carbide, dicopper acetylide. Contact with hydrogen peroxide causes violent decomposition to oxygen gas. Violent reaction with chlorine trifluoride, metal powders, nitrous acid, phospho-nium iodide, red or yellow phosphorus, sulfur. Incompatible with acetyUdes, acrylonitrile, alcohols, alkalis, ammonium hydroxide, arsenic, arsenites, bromides, carbonates, carbon materials, chlorides, chlorosulfonic acid, cocaine chloride, hypophosphites, iodides, iodoform, magnesium, methyl acetylene, phosphates, phosphine, salts of antimony or iron, sodium salicylate, tannic acid, tartrates, thiocyanates. Attacks chemically active metals and some plastics, rubber, and coatings. 

The argentic ion, Ag2 +, which is paramagnetic with an unpaired electron, is obtained in HC104 or HN03 solution by oxidation of Ag+ with ozone or by dissolution of AgO in acid. 

The characteristic color reaction of nicotinic acid with cyanogen bromide and /3-naphthylamine has been studied. The product is believed to be X-201. Argentic picolinate is a powerful oxidizing agent Thus, toluene is oxidized to benzyl alcohol, benzaldehyde, and benzoic acid in a stepwise, controllable manner. Primary alcohols were converted to aldehydes, secondary alcohols to ketones. Amines were oxidized to aldehydes or ketones in dimethylsulfoxide. 

Chloroplasts were incubated with [ " C]acetate to isolate MCTE activity from p-oxidation. Radiolabelled fatty acids were extracted and separated using successive argentation thin layer chromatography (TLC) and Cig-reverse phase TLC. The Brassica chloroplasts did not synthesise fatty acids well whereas control spinach chloroplasts incorporated [ " CJacetate into fatty acids at a rate of 100-300nmol/hour/mg chlorophyll, the Brassica chloroplasts had a specific activity of only approximately 20nmol/hour/mg chlorophyll. 

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