Phosphoric acid reactions

Imidazole-5-thione, 4,4-diphenyl-tautomerism, 5, 368 3 H-Imidazole-2-thione, 1,3-dimethyl-structure, 5, 367 Imidazole-2-thiones acidity, 5, 367 betaines, 5, 372 synthesis, 5, 481 tautomerism, 5, 367 3H-Imidazole-2-thiones synthesis, 5, 473, 6, 992 Imidazolides deacylation, 5, 453 mass spectra, 5, 360 phosphoric acid reactions, 5, 454 reactions, 5, 451-453 Imidazolidine, l-alkyl-3-phenyl-N-oxidation, 5, 427 Imidazolidine, 1,3-benzyl-2-phenyl-oxidation, S, 427... 

Das Sharma S, Patil DT, Gopalan K (2002) Temperature dependence of oxygen isotope fractionation of CO2 from magnesite-phosphoric acid reaction. Geochim Cosmochim Acta 66 589-593 Dauphas N, Marty B (1999) Heavy nitrogen in carbonatites of the Kola peninsula a possible signature of the deep mantle. Science 286 2488-2490 Dauphas N, Rouxel O (2006) Mass spectrometry and natural variations in iron isotopes. Mass Spectrom Rev 25 515-550... 

Thermal decomposition produces ammonia and phosphoric acid reaction with sulfuric acid produces ammonium hydrogen sulfate ... 

The reaction of acetic anhydride with phosphoric acid will generate the same electrophile and offers the advantage that only the monoacyl produci results. Acylation of the first ring deactivates the second and the concentration of CHjC O from the phosphoric acid reaction is too small to produce the diacyl product. 

The oxidations of hypophosphorous acid, reaction (1), and of phosphorous acid, reaction (2), have been studied . ... 

The first step of the reaction involves iodination of the aromatic compound with the triiodide salt in the presence of water as a solvent. The water should contain from 0.7 to 1.25 molar equivalents of a hydroxide, preferably an alkali metal hydroxide, and from 1-2 molar-equivalents of an alkali metal triiodide (e.g. iodine plus sodium iodide). The aqueous solvent should also contain from 0.1 to 20 mole % of an acid catalyst, which may be a mineral acid such as sulfuric, hydrochloric or phosphoric acid. Reaction is carried out at temperatures ranging from 20°-120° C. If the starting compound contains a nuclear substituent, iodination will occur in the ortho or para position on the nuclear ring. 

Meszaros et alJ found that it melts at 99-100 C. The structure was proved by UV, IR, and H NMR. The product isolated by Shur and Israelstam was probably the monoester (mp = 153-154°C) of the malonate (70 R = 6-Me), which is easily formed from the pyridopyrimidine (71 R = 6-Me) under the conditions applied to the poly phosphoric acid reaction mixture. 

Ammonium Phosphate. Ammonium phosphates have a long history of use as a fertilizer. They are not as easily leached from the soil as ammonium nitrate, but cannot be made in high nitrogen concentrations. There are three forms of ammonium phosphate monoammonium phosphate (MAP, NH4H2P04), diammonium phosphate (DAP, [NH4]2HP04), and triammonium phosphate (TAP, [NH4]3P04). Unfortunately, triammonium phosphate is unstable and loses ammonia easily. Ammonium phosphates are produced by reacting ammonia with phosphoric acid (Reaction 3.8). 

The carbamates LXXXIX are also obtained upon treatment of XC with a variety of acids, such as hydrogen chloride, carboxylic acids, and phosphoric acid Reaction of XC with amines yields the 0,N-acetals XCII. For example, the monosubstituted products, derived from phenols (XC, R = aryl) upon reaction with alkyl amines afford the corresponding 0,N-acetals, which are useful herbicides... 

Phosphoric acid Reaction of sulfuric acid with phosphate rock Fertilizers, detergents, and water-treating... 

The production of ammonium phosphate fertilisers is an example of acidic and alkali media neutralisation under commercial plant conditions [1]. During the production of ammonium phosphate, at the liquid ammonium and phosphoric acid reaction stage, a six-section tubular turbulent reactor of diffuser-confusor design is used. The reactor maintains turbulence along its length, with a reactor diameter of 220 mm and confusor diameter of 105 mm the reactor operates in a normal mode at a... 

Similarly, Figure 2.4 shows the freezing point for concentrated aqueous phosphoric acid solutions and illustrates that using concentrated phosphoric acid solutions as the reaction medium allows for the polymerization of aniline at temperatures as low as 223 K (—55°C) without the use of ionic salt additives. A series of reactions similar to those in sulfuric acid at different temperatures between —10°C and —55°C were carried out in 60 wt% phosphoric acid reaction mixture. The stoichiometric persulfate oxidant/aniline monomer ratio was again 1.25 1 and this enabled polymer yields greater than 90% to be successfully obtained for all syntheses. The purpose was to show that a standard reaction mixture and procedure could be utilized, where the only variables are the temperature and time of reaction. As noted earlier, different temperatures result in different molecular weight polyaniline. The total reaction time may be varied to suit the rate of reaction at a particular temperature. The Hammett acidity of 60% phosphoric acid is about —1.6, at 20°C, and increases with decreasing temperature. The total reaction time was between 43 and 46 b, with the exception of the polyaniline powder synthesized at —55°C, which was 90 h due to the slower reaction kinetics. 

Alternatively, an inorganic form of the element can be conveniently converted to the desired gaseous form. A standard method for preparing CO2 is the controlled reaction of carbonate with phosphoric acid (reaction [III]) ... 

The tris (dialkylamino)phosphines dissolve in dilute acids and then decompose to amine and phosphorous acid. Reactions are given in Figure 7.2. 

Ammonia and phosphoric acid Reaction in stirred tank reactor (PhoSAI [at atm pressure] and Minifos process [at 0.21 Mpa]) [11] None Monoammonium phosphate powder [12]... 

Oxidation of an aldehyde group to the mixed anhydride of a carboxylic acid and phosphoric acid (Reaction 6). 

Phosphate Bond. Cold-setting bonds for refractories can be formed by reactions between oxides and phosphoric acid, phosphate-phosphoric acid reactions or the direct use of liquid phosphate bonds. The bond is due to the formation of an acid phosphate, with weakly basic or amphoteric oxides. 

This is an old process using a solid bed of phosphoric acid. Reaction takes place in the vapor phase. Feed is normally propylene. Products are hexane and nonane. Polymerization is a very exothermic process. 

Dialkyl from trialkyl phosphites and phosphorous acid Reactions of dialkyl phosphites... 

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