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3 often prepared as the tributylammonium ((C 4 H 9) 3 NH +) or tetrabutylammonium ((C 4 H 9) 4 N + salt. The anion features phosphorus(V) bonded to three tetrachlorocatecholate (C 6 Cl 4 O 2− 2) ligands. This anion can be resolved into the axially chiral enantiomers, which are optically stable (the picture shows the Δ enantiomer).
The pyrophosphate bond is also sometimes referred to as a phosphoanhydride bond, a naming convention which emphasizes the loss of water that occurs when two phosphates form a new P−O−P bond, and which mirrors the nomenclature for anhydrides of carboxylic acids.
For example, treatment of Bu 4 NOH with disodium pyrophosphate, Na 2 H 2 P 2 O 7, gives (Bu 4 N) 3 [HP 2 O 7], which is soluble in organic solvents. [2] Similarly, neutralization of Bu 4 NOH with hydrofluoric acid affords a relatively water-free Bu 4 NF. This salt dissolves in organic solvents and is useful in desilylation. [3]
Since the ends are condensed, its formula has one less H 2 O (water) than tripolyphosphoric acid. The general formula of a phosphoric acid is H n −2 x +2 P n O 3 n − x +1 , where n is the number of phosphorus atoms and x is the number of fundamental cycles in the molecule's structure; that is, the minimum number of bonds that would have to ...
Pyrophosphoric acid, also known as diphosphoric acid, is the inorganic compound with the formula H 4 P 2 O 7 or, more descriptively, [(HO) 2 P(O)] 2 O. Colorless and odorless, it is soluble in water, diethyl ether, and ethyl alcohol.
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It is used to prepare many other tetrabutylammonium salts by salt metathesis reactions. The anhydrous form is a white solid. [2] In addition to being cheap, tetrabutylammonium bromide is also environmentally friendly, has a greater degree of selectivity, is operationally simple, non-corrosive, and can be recycled easily as well. [5]
Both triammonium salts evolve ammonia. In contrast to the unstable nature of the triammonium salts, the diammonium phosphate (NH 4) 2 HPO 4 and monoammonium salt (NH 4)H 2 PO 4 are stable materials that are commonly used as fertilizers to provide plants with fixed nitrogen and phosphorus. [3] Ammonium phosphate is the main ingredient in pink ...