Dipotassium

Chemical Name 7-chloro-2,3-dihydro-2,2-dihydroxy-5-phenyl-1 H-1,4-benzodiazepine-3-carboxylic acid dipotassium salt 

Trade Name Manufacturer Country Year Introduced 

The complex is decomposed by stirring the reaction mixture into a solution prepared from 500 g of ammonium chloride in 2,000 ml of water to which 3 kg of crushed ice have been added. After extraction and washing, the ether is evaporated in vacuo at 40°C. The oily residue is taken up in 500 ml of petroleum ether and left to crystallize by cooling at -20°C. The yellowish crystals formed are dried (309 g) MPi (Kofler block) 74°C yield 92%. 

After cooling, the solid is filtered by suction and washed with alcohol at 96°C. The product is dried at ordinary temperature in a high vacuum. A colorless solid is obtained (quantitative yield), which is completely soluble in water. The aqueous solution is strongly alkaline in reaction when acidified with acetic acid and heated on a water bath, it yields a precipitate of 7-chloro-5-phenyl-2-oxo-2,3-dihydro-1 H-benzo[fl-1,4-diazepine. 

Chemical Name 6-Chloro-2-cyclohexyl-2,3-dihydro-3-oxo-1H-isoindole-5-sulfonamide Common Name — 

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To obtain the free acid, the ester is hydrolysed by ethanolic potash to the dipotassium salt, which is converted into the insoluble silver salt. A hot aqueous... 

Collidine 2i5 d carboxylic acid. Boil a mixture of 5 g. of the ester (II) and 50 ml. of 15% ethanolic potash under reflux for 30 minutes. The dipotassium salt crystallises during the boiling and during the subsequent cooling. Filter off the potassium salt at the pump and wash it with a small quantity of ethanol. Dilute the filtrate with about an equal volume of ether to precipitate a further small crop of the salt. Yield of combined crops 4 5 g. from 5 g. of the estei (I). 

Dicalcium hexakiscyanoferrate [13821 -08 ] Ca2[Fe(CN)g], is formed as yellow crystals by reaction of Hquid or gaseous HCN with iron(II) chloride in water containing Ca(OH)2 or CaCO and having pH > 8. It is used to prevent caking of other substance and serves as a useful starting material in the preparation of other [Fe(CN)g] salts. Examples of mixed salts include calcium dicesium hexakiscyanoferrate [15415-35-7] CaCs2[Fe(CN)g], and calcium dipotassium hexakiscyanoferrate [20219-00-5] CaK2[Fe(CN)g]. 

Tetrapotassium peroxodiphosphate is produced by electrolysis of a solution containing dipotassium phosphate and potassium fluoride (52). Alkalinity favors the formation of the P20 g anion, whereas the PO anion is produced in larger yields in acidic solution. It is therefore possible to obtain an 80% yield of K4P20g by choosing the proper conditions. The tetrapotassium peroxodiphosphate can be crysta11i2ed from solution by evaporation of water to form a slurry. The crystals can be separated from the slurry and dried. The material is noncorrosive and cannot be catalyticaHy decomposed by iron ions. 

Henkel Rearrangement of Benzoic Acid and Phthalic Anhydride. Henkel technology is based on the conversion of benzenecarboxyhc acids to their potassium salts. The salts are rearranged in the presence of carbon dioxide and a catalyst such as cadmium or zinc oxide to form dipotassium terephthalate, which is converted to terephthahc acid (59—61). Henkel technology is obsolete and is no longer practiced, but it was once commercialized by Teijin Hercules Chemical Co. and Kawasaki Kasei Chemicals Ltd. Both processes foUowed a route starting with oxidation of napthalene to phthahc anhydride. In the Teijin process, the phthaHc anhydride was converted sequentially to monopotassium and then dipotassium o-phthalate by aqueous recycle of monopotassium and dipotassium terephthalate (62). The dipotassium o-phthalate was recovered and isomerized in carbon dioxide at a pressure of 1000—5000 kPa ( 10 50 atm) and at 350—450°C. The product dipotassium terephthalate was dissolved in water and recycled as noted above. Production of monopotassium o-phthalate released terephthahc acid, which was filtered, dried, and stored (63,64). 

Mitsubishi Chemical Industries, Ltd. practiced a Henkel II technology starting with toluene to produce benzoic acid. Reaction of benzoic acid with potassium hydroxide resulted in potassium benzoate, which was subjected to a disproportionation reaction to produce dipotassium terephthalate and benzene. Dipotassium terephthalate reacted with sulfuric acid, and the resulting terephthahc acid was recovered by filtration and drying (65,66). Here, dipotassium sulfate was the by-product. 

NMP are examples of suitable solvents for PES and PPSF polymerizations. Chlorobenzene or toluene are used as cosolvents at low concentrations. These cosolvents form an azeotrope with water as they distill out of the reaction mixture, thereby keeping the polymerization medium dehydrated. Potassium carbonate is a suitable choice for base. The synthesis of PES and PPSE differ from the PSE case in that the reaction is carried out in a single-step process. In other words, the formation of the dipotassium salt of the bisphenol is not completed in a separate first step. Equations 2 and 3 represent polymerizations based on the dipotassium salts of bisphenol S and biphenol to make PES and PPSE, respectively. 

Potassium tripolyphosphate [13845-36-8] K P O q, also used in detergents, is made by dehydrating an equimolar mixture of mono- and dipotassium phosphates. 

Tartar emetic was the subject of controversy for many years, and a variety of iacorrect stmctures were proposed. In 1966, x-ray crystallography showed that tartar emetic contains two antimony(III) atoms bridged by two tetranegative D-tartrate residues acting as double bidentate ligands to form dipotassium bis[D-p.-(2,3-dihydroxybutanedioato)]diantimonate [28300-74-5] (41). 

Dipotassium Tetraborate Tetrahydrate. Dipotassium tetraborate tetrahydrate, or K O -2B202 4H2O, formula wt, 305.49 ... 

DKP = dipotassium phosphate Poly = polyphosphate and SALP = sodium aluminum phosphate. Other terms may be found in the text. 

Of the higher diacids, the ahcycHc, unsaturated Diacid 1550 (the Westvaco C-21 diacid) is significantly water soluble and is moderately irritating both dermaHy and ocularly. The corresponding dipotassium salt. Diacid H-240, is substantially mote irritating (127). 

Dipotassium iron tetracartionyl in the synthesis ol aldehydes and ketones (tom alkyl halides. 

Triuret (1,3-dicarbamoylurea) [556-99-0] M 146.1, m 233°(dec). Crystd from aq ammonia. Gives mono and dipotassium salts. 

Biquinolin-4,4 -dicarboxylic acid dipotassium salt [63451-34-3] M 420.51. Recryst from H2O. The Cu salt has 3. max 3t 562nm. [Anal Biochem 56 4409 1973.]... 

A solution of 66.5 g. (1.01 moles) of 85% potassium hydroxide in 300 ml. of water in an 800-ml. beaker is heated to 60-70 , and 100 g. (0.505 mole) of commercial 1,8-naphthalic anhydride (Note 1) is stirred in. The pH of the resultant deep-brown solution is adjusted to a value of 7 (Note 2) with 6N hydrochloric acid and 3N potassium hydroxide. It is treated with 10 g. of decolorizing carbon and filtered. This operation is repeated. The filtrate is concentrated in a 1.5-1. beaker on a steam bath to about 180 ml. The concentrate is cooled to room temperature, 800 ml. of methanol is added with vigorous stirring by hand, and the mixture is cooled to 0-5°. The precipitated dipotassium naphthalate is separated by filtration, washed with 150 ml. of methanol, and dried in a vacuum oven at 150°/150 mm. The dried cream-colorcd salt weighs 130 135 g. (88 92%). 

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