Potassium carbonate nitrite

Required Sulphuric acid, 27-5 ml. aniline, 24 ml. sodium nitrite, 20 g. dry potassium carbonate, 3-4 g. (To ensure that the potassium carbonate is dry, it should be gently heated in an evaporating-basin over a small Bunsen flame for 4-5 minutes with stirring, and then allowed to cool in a desiccator.)... 

N-Nitrosodiethylamine. Add 36-5 g. (51-5 ml.) of diethylamine slowly to the calculated quantity of carefully standardised 5A-hydra chloric acid cooled in ice (1). Introduce the solution of the hydi ochloride into a solution of 39 g. of sodium nitrite (assumed to be of 90 per cent, purity) in 45 ml. of water contained in a 250 ml. distilling flask. Distil the mixture rapidly to dryness. Separate the yellow upper layer of the nitrosamine from the distillate saturate the aqueous layer with soUd potassium carbonate and remove the nitroso compound which separates and add it to the main product. Dry over anhydrous potassium carbonate and distil. Collect the diethylnitrosamine at 172-173-5°, The yield is 41 g. 

Quite recently, it was reported that heating of tetracyano derivative 268 with potassium nitrite and potassium carbonate in DMF provided 53% of phenoxathiin 270 (Scheme 42) (OOlHl 161). The probable mechanism is, that one activated nitro group in 268 is displaced with a nitrosoxy group by nucleophilic substitution of nitrite ion, followed by hydrolysis to 269, which then undergoes denitrocyclization reaction to the final product. 

C03-0109. The following pairs of substances are quite different despite having similar names. Write correct formulas for each, (a) sodium nitrite and sodium nitrate (b) potassium carbonate and potassium hydrogen carbonate (c) iron(II) oxide and iron(IIt) oxide and (d) iodine and iodide ion. 

Analytical decomposition of powdered diamond by fusion with potassium hydroxide may become explosive. This can be avoided by fusion with a potassium carbonate-sodium carbonate mixture, followed by addition of small portions of potassium nitrite or nitrate. 

Lithium carbonate, 0533 Lithium dithionite, 4687 Magnesium carbonate hydroxide, 0534 Magnesium nitrate, 4693 Magnesium nitrite, 4692 Magnesium sulfate, 4696 Potassium carbonate, 0531 Potassium nitrite, 4649 Silver hyponitrite, 0031 Sodium acetate, 0779 Sodium carbonate, 0552 Sodium disulfite, 4808 Sodium dithionite, 4807 Sodium hydrogen carbonate, 0390 Sodium hydrogen sulfate, 4446 Sodium metasilicate, 4805 Sodium nitrite, 4720 Sodium sulfate, 4806 Sodium tetraborate, 0185 Sodium thiosulfate, 4804... 

Routes to benzoxadiazoles are based on approaches to the tautomeric 6-diazo-2,4-cyclo-hexadienones (Scheme 11) <9UST(247)135>. The appropriate 2-aminophenol hydrochloride is diazo-tized using either sodium nitrite or isoamyl nitrite and the diazonium chloride is then carefully neutralized with sodium carbonate or potassium carbonate. An alternative approach is from the monotosylhydrazone of the appropriate o-benzoquinone. Naphthoxadiazole (6) was prepared, in a manner analogous to the first route of Scheme 11, from 3-amino-2-naphthol <91AG(E)1476>. A slightly modified preparation is described in a later paper the method was applied to the synthesis of [9a- C]naphth[2,3-( ]-l,2,3-oxadiazole from 3-amino-[2- C]-2-naphthol <92Mi 403-03>. 

Nitronium tetrafluoroborate. Acetonitrile, Ammonium carbonate. Potassium carbonate. Diethyl ether, Acetone, Ethyl acetate. Butanol Sulfamic acid, Potassium hydroxide. Ethanol, Nitric acid, Sulfuric acid, Acetone, Isopropyl alcohol Dioxane, Potassium nitrite. Potassium bicarbonate, Tetranitromethane Lead acetate, Sodium azide Sodium azide, Lead acetate. Water... 

The amine (0.1 mole) is dissolved in a buffered (pH 4-5) solution of 500 ml of 60 % aqueous acetic acid and 68 gm of sodium acetate. The reaction mixture is warmed to 90°C. Then 69 gm (1.0 mole) of sodium nitrite dissolved in 100 ml of water is added dropwise over a 45 min period while heating at 90°C is continued. After the addition, the reaction mixture is heated for 2 hr, cooled, poured into 200 ml of cold water, and extracted three times with 200 ml portions of ether. The ether was washed with 10 % potassium carbonate solution until basic, then with saturated sodium chloride solution, dried, stripped, and distilled to obtain the products shown in the table. 

Sample powders were dried in a vacuum oven at 60 C for 7 hours and cooled to minimize the hysteresis effect prior to storage in the dessicators of various water activities. In addition to Drierite, five saturated salt solutions were used in dessicators. These salt solutions were lithium chloride, magnesium chloride, potassium carbonate, sodium nitrite and potassium chloride. Their water activities were 0.110, 0.330, 0.440, 0.650 and 0.850, respectively, at 20 C. Each sample contained 1.2 to 1.5 g powder and four-week equilibration time was employed. The percentage of... 

B. Ethyl N-nitroso-N-benzylcarbamate (Note 2). In a 12-1. three-necked flask fitted with a thermometer, a 2-1. addition funnel (Note 3), and a gas outlet tube are placed a solution of 360 g. (2.0 moles) of ethyl N-benzylcarbamate in 2 1. of ether and a solution of 1.2 kg. (17.4 moles) of sodium nitrite in 2 1. of water. A stirrer is not used. The reaction mixture is cooled by means of a water bath to 20° and treated with a solution of 1 1. each of concentrated nitric acid and water, contained in the addition funnel. Enough of this solution is added to impart a permanent green color to the aqueous layer, and the remainder is then added over a period of 5 hours at such a rate as to keep the aqueous phase green (Note 4) and the temperature at 25-30°. The reaction mixture is allowed to stand an additional 30 minutes, and the layers are separated. The ether layer is washed with 200-ml. portions of 10% potassium carbonate solution (Note 5) until the evolution of gas ceases and is then dried over anhydrous potassium carbonate. The ether is removed under vacuum on a water bath kept below 50° (Note 6), a residue of 400-415 g. (95-100%) of a bright orange oil (Note 7) being left. 

Potassium Cobalti-nitrite, K3Co(N02)6. H20, is the most familiar example of this type. It is also known as cobalt yellow and Fischer s salt in honour of its discoverer.1. It is readily prepared by adding potassium nitrite to an aqueous solution of a soluble cobalt salt acidified with acetic acid. It results in a very pure condition when cobalt carbonate is suspended in an aqueous solution containing an equivalent amount of potassium carbonate or nitrite, and treated with nitrous fumes (resulting from the action of nitric acid upon arsenious oxide) until it has suffered complete decomposition.2 The amount of combined water varies from 0 to 4 molecules according to circumstances. 

The tests are carried out upon a clean charcoal block in which a small cavity has been made with a penknife or with a small coin. A little of the substance is placed in the cavity and heated in the oxidizing flame. Crystalline salts break into smaller pieces burning indicates the presence of an oxidizing agent (nitrate, nitrite, chlorate, etc.). More frequently the powdered substance is mixed with twice its bulk of anhydrous sodium carbonate or, preferably, with fusion mixture (an equimolecular mixture of sodium and potassium carbon-... 

Gn drying bases with caustic potash or caustic soda, it must be borne in mind that these drying agents may be contaminated, at times, with potassium nitrite or sodium nitrite. Since these latter act upon bases, decomposing them, it is necessary to use the pure alkalies, or in place of them potassium carbonate or Glauber s salt. 

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