Ammonium peroxodisulfate

Peroxodisulfates. The salts of peroxodisulfuric acid are commonly called persulfates, three of which are made on a commercial scale ammonium peroxodisulfate [7727-54-0] (NH4)2S20g potassium peroxodisulfate [7727-21-1] K2S20g and sodium peroxodisulfate [7775-27-1] Na2S20g. The peroxodisulfates are all colorless, crystalline soHds, stable under dry conditions at ambient temperature but unstable above 60°C. 

Beaded acrylamide resins (28) are generally produced by w/o inverse-suspension polymerization. This involves the dispersion of an aqueous solution of the monomer and an initiator (e.g., ammonium peroxodisulfates) with a droplet stabilizer such as carboxymethylcellulose or cellulose acetate butyrate in an immiscible liquid (the oil phase), such as 1,2-dichloroethane, toluene, or a liquid paraffin. A polymerization catalyst, usually tetramethylethylenediamine, may also be added to the monomer mixture. The polymerization of beaded acrylamide resin is carried out at relatively low temperatures (20-50°C), and the polymerization is complete within a relatively short period (1-5 hr). The polymerization of most acrylamides proceeds at a substantially faster rate than that of styrene in o/w suspension polymerization. The problem with droplet coagulation during the synthesis of beaded polyacrylamide by w/o suspension polymerization is usually less critical than that with a styrene-based resin. 

Oxidation of 2-mercapto-l,2,4-triazolo[l,5-c]pyrimidines (174) with chlorine or bromine in water (64BRP951652 65JCS3369), with hydrogen peroxide and chlorine (95MIP1), as well as with sodium chlorate in hydrochloric acid (94JMC2371) gave the corresponding 2-sulfonyl halide derivatives 175. Oxidation of the 2-alkylmercapto compounds 176 to the 2-alkylsufonyl derivatives 177 was made with ammonium peroxodisulfate and sulfuric acid... 

Ammonium Peroxodisulfate, HgNjOgS A mixt with A1 and W may explode H.A.J. Pieters et al, Safety In The Chemical Laboratory , Academic Press, London (1957)... 

Lowenstein-Riedel An electrolytic process for making hydrogen peroxide by the electrolysis of a solution of sulfuric acid and ammonium sulfate. Ammonium peroxodisulfate, (NH4)2S208, is an intermediate. This, and the Weissenstein process were made obsolete with the invention of the AO process. 

Ammonium peroxodisulfate, 13 408 Ammonium perrhenate, 21 688, 690 rhenium content in, 21 695 specifications for, 21 693t Ammonium phosphates, 2 684, 708 ... 

CEC capillary columns filled with hydrophilic polymer gels mimic those used for capillary gel electrophoresis [91]. Typically, the capillary is filled with an aqueous polymerization mixture that contains monovinyl and divinyl (crosslinking) acrylamide-based monomers as well as a redox free radical initiating system, such as ammonium peroxodisulfate and tetramethylethylenediamine (TEMED). Since initiation of the polymerization process begins immediately upon mixing all of the components at room temperature, the reaction mixture must be used immediately. It should be noted, that these gels are very loose, highly swollen materials that usually contain no more than 5% solid polymer. 

Ammonium nitrate, 4522 Ammonium permanganate, 4518 Ammonium peroxodisulfate, 4576 Antimony pentachloride, 4184 Barium chlorite, 0204... 

Ammonium hydroxyoxodiperoxochromate(l—), 4230 Ammonium pentaperoxodichromate(2—), 4247 Ammonium peroxoborate, 0146 Ammonium peroxodisulfate, 4576 Ammonium tetraperoxochromate(l—)... 

AMMONIUM PEROXODISULFATE SODIUM SULFIDE EARTHQUAKE, SOLVENT CABINETS... 

Acetohydrazide, 0912 Acetone oxime, 1258 Acetylenedicarboxylic acid, 1405 Acrylaldehyde, 1145 f Allyl acetate, 1912 A-Ally lthiourca. 1600 4-Aminophenylazobenzene, 3487 Ammonium dichromate, 4246 Ammonium peroxodisulfate, 4576 4-Azidobenzaldehyde, 2697 2-Azido-2-phenylpropane, 3159 f Aziridine, 0863 Azobenzene, 3483 Azoformamide, 0816 Azoisobutyronitrile, 3011 Azoxybenzene, 3485 Benzaldehyde oxime, 2760... 

Ammonium peroxodisulfate is more soluble in water than the potassium salt furthermore, it dissolves in more polar organic solvents (e.g., DMF), so that it is sometimes also used for initiating polymerizations in organic media. In polymerizations initiated by peroxodisulfates the reaction medium is liable to become acidic, so that buffering is generally necessary (see Example 3-2). 

Polymerization of Vinyl Acetate with Ammonium Peroxodisulfate in Emulsion... 

Hydrophobic monolithic methacrylate capillary columns have been introduced by copolymerization of butyl methacrylate and EDMA as cross-linking agent. The polymerization, however, was not thermally or photochemically but chemically initiated ammonium peroxodisulfate [154]. The resulting monolithic columns were applied to RP separation of small analytes like uracil, phenol, or alkylbenzenes. Reasonable results have been obtained under isocratic conditions, delivering typical values for theoretical plate height ranging between 40 and 50 pm. 

The kinetics of the potassium hexacyanoferrate(III)-catalysed oxidation of glucose with ammonium peroxodisulfate have been studied.82 The kinetics and mechanism of oxidation of some cycloalkanols by alkaline Fe(CN) have been reported.83 The same group has also studied the oxidation of cycloalkanones under comparable conditions and determined the order of reactivity as cyclohexanone > cyclopentanone > cyclo-octanone > cycloheptanone.84 Palladium(II) has been found to catalyse the oxidation of formaldehyde, thiourea, and thioacetamide by alkaline Fe(CN)g, whereas no effect is observed in the oxidation of acetaldehyde.85 The orders of reaction have been determined and a mechanism was proposed. 

See Halogens or Interhalogens above Ammonium nitrate Metals Ammonium peroxodisulfate Iron Dinitrogen tetraoxide Metals Hydrogen peroxide Metals Nitryl fluoride Metals Peroxyformic acid Potassium dichromate Iron Potassium perchlorate Metal powders Sodium peroxide Metals... 

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