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Title:	Potassium Ferrate
Authors:	Korol, Nataliya Slivka, Mikhailo
Issue Date:	13-Mar-2018
Publisher:	John Wiley & Sons, Ltd
Citation:	[13718‐66‐6] FeK2O4 (MW 198.05) InChI = 1S/Fe.2K.4O/q;2*+1;;;2*‐1 InChIKey = ICBFRPYDFGVTEQ‐UHFFFAOYSA‐N (selective oxidant for alcohols and amines1) Solubility: sol water; insol typical organic solvents. Form Supplied in: violet solid; typical impurities present include potassium chloride and iron(III) oxide. Analysis of Reagent Purity: analysis of K2FeO4 by chromite ion has been reported.2 The ferrate concentration may be determined by measurement of the absorption band at 510 nm.3 Preparative Methods: NaOCl (20 g) is added to a solution of NaOH (30 g in 75 mL H2O) while keeping the solution temperature under 20 °C. Solid NaOH (70 g) is added with stirring, while maintaining the solution temperature at 25–30 °C, the solution cooled to 20 °C and filtered. Fe(NO3)3ċ9H2O (25 g) is added slowly, and the solution saturated with NaOH while being kept at 30 °C. After filtration, the filtrate of sodium ferrate is placed in a 20 °C bath and treated with saturated aqueous KOH (100 mL), stirred for 5 min, and filtered. The precipitate is washed several times with 10 mL portions of 3 M KOH into 50 mL of chilled saturated KOH solution, and a further 50 mL of chilled saturated KOH solution added to the washings. After stirring for 5 min, the solution is filtered, and the precipitate washed with benzene (10 mL) and several times with ethanol (20 mL). The precipitate is stirred with ethanol (1 L) for 20 min and the ethanol removed by filtration; this process is repeated three times. The precipitate is finally washed with Et2O under a drying tube, and drying continued in a vacuum desiccator.4 Handling, Storage, and Precautions: dry K2FeO4 is stable and should be stored in a desiccator. K2FeO4 is very unstable in acidic solutions, but decomposes only slowly in basic solutions.
Series/Report no.:	Encyclopedia of Reagents for Organic Synthesis;
Type:	Text
Publication type:	Стаття
URI:	https://dspace.uzhnu.edu.ua/jspui/handle/lib/21264
Appears in Collections:	Наукові публікації кафедри органічної хімії

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