Diphosphoric phosphoric acids

Two examples of condensed phosphoricfV) acids are heptaoxo-diphosphoric(V) (pyrophosphoric) and polytrioxophosphoric (meta-phosphoric) acids. 

Pyrophosphoric (diphosphoric) acid, H4P2O2, is the only condensed phosphoric acid definitely obtainable ia crystalline form. It has a theoretical P2O5 content of 79.8%. However, Hquid polyphosphoric acid of such content shows by analysis only 42.5% the remainder is phosphoric acid and... 

There also exists interference from diphosphoric acid, other more highly condensed phosphoric acids, and their organic derivatives. The free phosphoric acid can be determined as a heteropolyacid complex of phosphoric acid and ammonium molybdate. Afterward the complex is reduced by stannum II chloride to molybdenum blue. The amount of this dye can be measured photometricly at 625 nm. Organic derivatives of phosphoric acid and condensed phosphoric acids do not interfere with this method. 

A feature of phosphoric acid is that it forms a series of poiymeric anhydrides that resembie carboxyiic acid anhydrides in structure and reactivity. Diphosphoric acid (formeriy caiied pyrophosphoric... 

Diphosphoric Acid Phosphoric acid is sometimes called orthophosphoric acid to distinguish it from... 

The chemistry of the amido- and imido-diphosphoric acids is not in a satisfactory state. The interpretation of the experimental work by different investigators is discordant, showing a lack of precise facts. The reports of the preparation and properties of the three amidophosphoric acids indicated above are largely based upon the work of J. H. Gladstone and J. D. Holmes.1 A. Mente s and H. N. Stokes re-survey of the field outlined by J. H. Gladstone and J. D. Holmes shows that the interpretation of the results was probably erroneous in other words, the amido-diphosphoric acids reported by J. H. Gladstone and J. D. Holmes may really be imido-diphosphoric acids, or mixtures of the same with meta- and pyro-phosphoric acids. A number of amidopyrophosphoric acids have been... 

The reaction of a molten mixture of 3,4-dihydro-2//-pyrido[ 1,2-a] pyrimidin-2-one 675 and phosphorous acid with phosphorus trichloride, followed by treatment of the reaction mixture with 2 N aqueous hydrochloric acid, afforded 3,4-dihydropyridopyrimidine-2,2-diphosphoric acid 676 in 38% yield (91GEP3930130). Catalytic reduction of diphosphonic acid 676 in water over platinum dioxide gave hexahydropyrido[l,2-a]pyrimi-dine-2,2-diphosphonic acid 677. 

Certain inorganic and simple carbon-containing compounds are commonly given non-systematic or semi-systematic names containing the word acid . Examples are boric acid or orthoboric acid, metaboric acid, phosphoric acid, diphosphoric acid, cyc/o-triphosphoric acid, cafena-triphosphoric acid, dithionous acid, peroxodisulfuric acid or peroxydisulfuric acid, etc. These names are unique in modern nomenclature in that, interpreted literally, they describe a particular chemical property of the compounds in question. Systematic names are otherwise based solely on composition and structure. 

From Diphosphoric Tetrafluoride (Phosphorodifluoridic Anhydride, Difluoro-phosphoric Acid Anhydride)... 

DIPHOSPHORIC ACID, TETRAETHYL ESTER (107-49-3) CgHjcO Pj Reacts with water, forming phosphoric acid and flammable ethylene gas. Alkalis or elevated temperatures above 300°F/149°C can cause deconqjosition, forming flammable ethylene gas and toxic phosphoms oxides. Reaction... 

DIPHOSPHORIC ACID, TETRAETHYL ESTER (107-49-3) Reacts with water, forming phosphoric acid and flammable ethylene gas. Alkalis or elevated temperatures above 300°F/150°C can cause decomposition, forming flammable ethylene gas and phosphorus oxides. Aqueous solution is incompatible with sulfuric acid, alkalis, ammonia, aliphatic amines, alkanolamines, alkylene oxides, amides, epichlorohydrin, nitromethane, organic anhydrides, isocyanates, vinyl acetate. Attacks some plastics, rubber, and coatings. Corrosive to metals in the presence of moisture. 

Junowicz-Kocholaty. J. Biol. Chem. 149, 71 (1943) by reductive cleavage of glyceraldehyde 1-benzyl ether 3-phosphoric acid Fischer, Baer, Ber. 65, 337. 1040 (1932) by hydrolysis of dimeric gylceraldehyde 1,3 -diphosphoric acid Baer, Fischer, J. BioL Chem. 150, 213 (1943) by hydrolysis of dimeric glyceraldehyde 1-bromide 3-phosphoric acid ibid. 223. See also Baer in Biochem. Prepn. I, 50 (1949). Prepn of D-form by enzymatic route Meyerhof, Junowicz-Kocholaty, toe. cit by synthetic route Ballou, Ftscher, J. Am. Chem. Soc. 77, 3329 (1955). 

The dehydration reaction (elimination of H2O) between phosphoric acid (H3PO4) and diphosphoric acid (H4P2O7) results in the molecule H5P3O10 or tripolyphosphoric acid. A further dehydration reaction with phosphoric acid results in the formation of H6P4O13 or tetrapolyphosphoric acid. 

Phosphoric acid, diphosphoric acid, and triphosphoric acid and their organic derivatives are important in carbohydrates and nucleic acids (Chapters 18, 21). 

Diphosphoric acid is formed by dehydration between pairs of phosphoric acid molecules. The oxygen linkage between the two phosphate units is an anhydride linkage ... 

Triphosphoric acid, formed by dehydration between phosphoric acid and diphosphoric acid, contains two anhydride linkages ... 

Phosphorus is capable of making many different oxoacids of which some of most important are orthophosphoric acid, Ff3P04. diphosphoric acid, 4 207, which is a dimeric example of the series of orthophosphoric acid anhydrates called pyrophosphoric acid. Metaphosphoric acid is a polymeric form of phosphorous acid, HPOg. Since these substances, and the other oxoacids, are unstable and fairly easily convert into orthophosphoric acid is by far the most widely encountered, and for the same reason it is normally referred to as just phosphoric acid without the prefix ortho. 

Synonyms Bis-0,0-diethylphosphoric anhydride Diphosphoric acid, tetraethyl ester Ethyl pyrophosphate, tetra- Pyrophosphoric acid, tetraethyl ester TEP TEPP Tetraethyl diphosphate Tetraethylpyrophosphate Classification Phosphoric acid ester Empirical C8H20O7P2... 

Adenosine triphosphate disodium, A-39 Adenosine triphosphate, A-39 Adenosine 5 -triphosphoric acid, A-39 Adenosine 5 -uridine 5 -phosphate, A-40 Adenosine 5 -[4-(fluorosulfonyl)benzoate], F-17 Adenosine, A-31 e-Adenosine, R-110 a-Adenosine, A-31 Adenosine-5 -carboxamide, A-41 Adenosine-5 -carboxylic acid, A-41 Adenosine-5 -diphosphoric acid, A-33 Adenosine-5 -N-ethyluronamide, A-41 Adenosine-5 -phosphoric acid, A-44 Adenosine-2 -phosphoric acid, A-45 Adenosine-5 -uronic acid, A-41 S -Adenosylhomocysteine, A-42 S -Adenosylmethionine, A-26 Adenosylsuccinic acid, A-43 Adenylic acid a, A-45... 

Fructose l,6-bis(dihydrogen phosphate), F-85 Fructose 2,6-bis(dihydrogen phosphate), F-86 Fructose 1-dihydrogen phosphate, F-87 Fructose 2-dihydrogen phosphate, F-88 Fructose 6-dihydrogen phosphate, F-89 Fructose 1,6-diphosphate, F-85 1,6-Fructose diphosphoric acid, F-85 D-Fructose phenylosotriazole, H-90 L-Fructose phenylosotriazole, H-90 Fructose 2-phosphate, F-88 Fructose 6-phosphate, F-89 v /-Fructose, P-108 Fructose, F-84 Fructose-1-phosphate, F-87 Fructose-6-phosphoric acid, F-89 Fructosone, H-94 Fructosyl phosphate, F-87 Fructosylamine, F-90... 

Trichloroacetonitrile Mixed phosphoric acid diesters from diphosphoric acid P, p2-diesters... 

Diammonium hydrogen phosphate see phosphoric acid, diammonium salt Diphosphoric acid (aqueous)... 

The main purpose of this section is to introduce derivatives of phosphoric acid. The acid chloride derivative is C1P0(0H)2, chlorophosphoric acid, and the amide derivative is phosphoramic acid, HgN-POCOHlg. These acid derivatives will not be discussed because they will not be used in this book. There are three ester derivatives of phosphoric acid a monoester 203, a diester 204, and a triester 205. There are also derivatives of pyrophosphoric acid (diphosphoric acid, 206), which include various esters. 

ATP contains two P—O—P groups, and A DP contains one. Hence ATP is a high-energy molecule relative to ADP and phosphoric acid, or to AMP (adenosine monophosphate) and diphosphoric acid, and ADP is a high-energy molecule relative to AMP and phosphoric acid. 

Phosporus exists in the sea in the form of ions of (ortho) phosphoric acid, H3PO4. About 10% of the inorganic phosphate in seawater is present as PO4 and practically all the remaining phosphate exists as HPO4. The condensed phosphoric acids, L, diphosphoric acid, H4P2O7, and all polyphosphoric adds with P-O-P linkages, have so far not been detected in open seawaters but are known to occur in estuarine and coastal waters as a result of pollution with detergents. 

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