Potassium orthophosphates

Potassium Phosphates. The K2O—P20 —H2O system parallels the sodium system in many respects. In addition to the three simple phosphate salts obtained by successive replacement of the protons of phosphoric acid by potassium ions, the system contains a number of crystalline hydrates and double salts (Table 7). Monopotassium phosphate (MKP), known only as the anhydrous salt, is the least soluble of the potassium orthophosphates. Monopotassium phosphate has been studied extensively owing to its piezoelectric and ferroelectric properties (see Ferroelectrics). At ordinary temperatures, KH2PO4 is so far above its Curie point as to give piezoelectric effects in which the emf is proportional to the distorting force. There is virtually no hysteresis. 

Likewise, there are at least 10 well-characterized potassium orthophosphates and several ammonium analogues. The presence of extensive H bonding in many of these compounds leads to considerable structural complexity and frequently confers important properties (see later). The... 

As described in U.S. Patent 2,929,763, methandrostenolone may be made by a fermentation route. 2 g of sodium nitrate, 1 g of primary potassium orthophosphate, 0.5 g of magnesium sulfate heptahydrate, 0.5 g of potassium chloride, 50 g of glucose and 1 g of Difco yeast extract are dissolved in one liter of tap water, brought to pH 5 by addition of a sodium hydroxide solution and sterilized. The resulting nutrient solution is inoculated with 50 cc of a 4-day-old shaking culture of Didyniel/a lycopersici and shaken for 48 hours at 27 C, whereby the culture becomes well developed. 

Liquid fertilizers, potassium orthophosphates in, 20 637 Liquid-film coefficient, 15 695 Liquid filtration, 11 322-323 Liquid flavor forms, 11 576-577 Liquid flow control, in variable-conductance heat pipes, 13 233 Liquid fluidization, 11 791-792 Liquid food ingredients, encapsulated,... 

Preparative scale reduction of oximes at a mercury or lead cathode in acid solution has been used in the conversion of the carbonyl function to amine. Originally, 30-50% sulphuric acid was used as solvent [195] but ethanol with dilute hydrochloric acid is usually satisfactory. Aliphatic and aromatic oximes give amines in 64-86% yields [196]. Aromatic ketoximes are also reducible in alkaline solution and acetophenone oxime has been converted to 1-phenylethylamine in a tri-potassium orthophosphate solution [197], The reduction of oximes in acid solution is tolerant of many other substituents as indicated by a number of examples [198, 199, 200. Phenylglyoxa monoxime in acid solution is however reduced at both the carbonyl and the oxime centres by sodium amalgam to yield 2-amino-1-phenylethanol [201]... 

Just recently, Stauffer and Steinbeiser [96] have presented an intermole-cular consecutive aryl amination-Suzuki coupling sequence where, in the presence of potassium orthophosphate as a weak base and Pd[P(ferf.-Bu)3]2 as a catalyst system, the morpholino-biaryl derivative 111 was obtained in moderate yield (Scheme 40). 

Potassium orthophosphates.—The normal salt, potassium orthophosphate, K3P04, is obtained by heating basic slag or native calcium phosphate with charcoal and potassium sulphate. The potassium sulphide simultaneously formed is converted into phosphate by addition of phosphoric acid, or the potassium phosphate is precipitated by addition of alcohol. The aqueous solution of the salt is very alkaline in reaction, owing to hydrolytic dissociation. The heat of formation from the elements in solution is 483-6 Cal.4... 

Effect of Phosphorus on the Metabolism of Iron and Zinc by Animals. These differences in the effects of phosphorus on zinc and iron metabolism are not peculiar to human studies. The differences can certainly be observed in studies with animals. Hegsted, et al. (31) and Buttner Muhler (41) found that the addition of sodium and potassium orthophosphate salts to diets depressed the utilization of iron by rats, but several groups of investigators have observed that these salts had no effect on iron metabolism by rats (29. 42, 43, 44). Other investigators have observed that the addition of sodium and potassium orthophosphate... 

Fewer studies have been published on the effects of sodium and potassium orthophosphate salts on zinc metabolism Four groups of investigators have found these phosphate salts depressed the utilization of zinc by rats (44. 50, 51) and steers (45) three groups have found these phosphate salts had no effect on zinc utilization by pigs (47) and chicks (52. 53). 

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