Silver salts and derivatives

Silver salts and derivatives [SED-15, 3140 SEDA-30, 269 SEDA-31, 393 SEDA-32, 420]... 

When tertiary alcohols are oxidized with bromine and a silver salt, tetrahydrofutan derivatives result (34). 

It explodes on rapid heating, like the analogous silver salt and 3-phenyl derivative. 

Li and co-workers374,374a reported the three-component coupling reaction of an aldehyde, an amine, and a terminal alkyne catalyzed by a silver salt in water. Of various precatalysts examined, water-insoluble silver iodide gave the highest yields of the propargyl amines 452 (Scheme 137). The reaction probably proceeds via attack of a silver acetylide, generated in situ from the silver salt and the alkyne, to the iminium ion derived from the aldehyde and the... 

Diorgano tellurium dicarboxylates were prepared from dialkyl and diaryl tellurium derivatives. Aliphatic carboxylic acids, aromatic carboxylic acids, their sodium or silver salts, and carboxylic acid anhydrides were used as reagents. Dicarboxylic acids such as succinic acid and phthalic acid were reported to give monomeric carboxylates when... 

SAFETY PROFILE Poison by intraperitoneal route. Moderately toxic by ingestion. Mutation data reported. A very dangerous fire hazard when exposed to heat, flame, or by chemical reaction with oxidizers. A severe explosion hazard when shocked or exposed to heat or flame. It is about as powerful as TNT. It is normally mixed with coUoided nitrocellulose or ammonium nitrate and paraffin wax. Can react vigorously with oxidizing materials and the derivatives can be explosive. The mercury and silver salts and other derivatives are much more impact-sensitive. When heated to decomposition it emits highly toxic fumes of NOx. See also NITRO COMPOUNDS. 

Salts have been prepared of 249 by oxidation of the heterocycle with SbClj, UClg, and MoOC. The perchlorate of 3,7-dimethoxy-phenothiazine cation-radical was prepared by oxidation using iminoxyl radicals in organic solvents followed by treatment with perchloric acid. " Various salts of 261 and its benzo derivatives and of lO-phenylphenothiazine were prepared by oxidation with iodine and the appropriate silver salt, " and radical salts of phenothiazine drugs have been made by oxidation of the heterocycles with the acid whose counterion was used for the salt perchlorate and sulfate. ... 

In 1914, Fischer had treated acetobromo-D-glucose with silver thiocyanate and had obtained, as the acetyl derivative, the iso thiocyanate. This work was later extended by Fischer and by others and, fairly recently, by Muller and Wilhelms and by Wilhelms. These authors substituted potassium thiocyanate for the silver salt and, under the conditions employed, the product was the thiocyanate. However, when this was heated, it isomerized and the isothiocyanate, identical with that obtained by Fischer, resulted. 

A reactive source of cyclopropane derivatives capable of furnishing cyclopropanone acetals is 1-chloro-l-methoxycyclopropane (33), which reacts with methanol in the presence of silver salts to give cyclopropanone dimethyl acetal (34) without rupture of the three-membered ring. It was subsequently shown that methanolysis, which occurs via an S l mechanism, does not require silver salts and occurs in quantitative yield with or without added base. ... 

Potassium salt. KC7H502N4 mw 216.26 N 25,91% OB to CO2 —107.28% ndles or leaflets. Sol in w and ethanol. Explds on heating, impact or contact with sulfuric acid Silver salt. AgC7H502N4 mw 177.16 N 19.6% OB to CO2 —130.96% white solid. Very expl Rathsburg proposed using the salts and derivatives of benzenyldioxytetrazotic acid in detonators and percussion caps Refs 1) Beil 9, 331 2) W. Lossen F. 

As regards synthetic methods, a full account has been given of the use of methyl 2,3,5-tri-O -benzoyl- D-ribofuranosyl carbonate in condensations with silylated heterocycles in the presence of silver salts and diphenyltin sulfide (see Vol. 27, p. 242), and similar condensatimis can also occur with high selectivity in the presence of tin(II) chloride in acetonitrile. Thp derivatives of heterocycles have been used in Vorbriiggen-type couplings, P-D-ribofuranosyl derivatives of purines, pyrimidines, imidazoles and pyrazoles being made in this way. ... 

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