Potas

C2H5NsOa. M.p. 118"C. Previously used as a precursor for the production of diazomelh-ane by treatment with 40% aqueous potas-... 

These are readily available from the interaction of alkyl halides with sodium or potas slum oyanide in aqueous alooholic solution (compare Section 111,113). 

Glutarlc acid (n =3), pimelic acid (n = 5) and suberic acid (n = 6) may be obtained from the corresponding dibromides. These are converted by aqueous - alcoholic potas-sium or sodium cyanide into the dinitriles, and this latter are smoothly hydrolysed by 50 per cent, sulphuric acid into the dicarboxybc acids ... 

Rcolinic acid Is readily prepared by the oxidation of a-picoline with potas-... 

An alternative oxidizing agent similar to chromic acid in Its reactions with or game compounds is potas Slum permanganate (KMn04)... 

For the preparation of methyl pota.ssium sulphate the same nii.amitv of methyl alcohol IS used in other respects the two processes are identical. The yield is 45—50 sji ams. ... 

Vaivuir TrN iins nr Cau itic PoTA in Sm ution from in -... 

Methyl alcoholic, pota- h, 557 Meihylaruiuc hyilrochloridr, 80 Methylafcd .(>irit, purilicatiou of, 4 j Mciliyl yariiih, 71)... 

The Na is 555 pm from the nearest N and 516 pm from the nearest O, indicating that it is a separate entity in the structure. Potas-sides, rubidides and caesides have similarly been prepared. The same technique has been used to prepare solutions and even crystals of electrides, in which trapped electrons can play the role of anion. Typical examples are [K(cryptand)]+e and [Cs(18-crown-... 

Pota.ssium pentathionate, K2SSO6, can be made by adding potassium acetate to Wackenroder s solution and solutions of the free acid HiSsOf, can then be obtained by subsequent addition of tartaric acid. 

The increase in values by prolctigiug the time of sapouifioatiaii is a strong indication ot terpinyl acetate, whieh is. as is well known, an ester much more resistant lo the action of alcoholic pota-sh than linalvl acetate. 

Dodge has based a process for the determination of benzaldehyde. A strong (2 5 N) alcoholic potash solution is required for the estimation, which is performed. by allowing a mixture of 10 c.c. of this solution with 1 to 2 grams benzaldehyde to stand at the ordinary temperature for twenty-four hours, after which the unabsorbed pota is titrated back with N/2 hydrochloric acid. A blank test is also made, and from the amount of potash entering into reaction, the percentage of aldehyde can be calculated. The process breaks down in the assay of natural oil of bitter almonds, probably due to the presence of benzaldehyde cyanhydrin. 

Thiocyan, n. thiocyanogen. -kalium, n. potas siuiii thiocyanate. 

Starch is a homopolymer of glucose forming an a-glucosidic chain, called a glucosan or glucan. It is the most abundant dietary carbohydrate in cereals, pota-... 

Phase diagrams for antimony/bis-muth and potas-sium/caesium at ambient pressure... 

Prior to xylan removal it is possible to extract from the plant material those hemicelluloses soluble in dilute alkali. Soluble hemicelluloses of this type are the principal impurities extracted with xylan and consist for the most part of low molecular weight polysaccharides and polyuronides. Corn cob holocellulose may be freed of these compounds (called hemicellulose-B fraction, see Figure 2) by extraction with potas-... 

Potassium fluoride in 1,2-ethanediol has further been used, as, for example, in the preparation of 5-deoxy-5-fluoro-D-ribose from methyl 2,3-0-isopropylidene-5-0-(methylsulfonyl)-a-D-ribofuranoside,87 and of 6-deoxy-6-fluoro-D-glucose from methyl 6-O-p-tolylsulfoiiyl-a-D-glucopyranoside.77 In one study of primary fluorinations with potas-... 

In a small round-bottomed flask the ethereal mother liquor is concentrated to a volume of 10 c.c., 50 c.c. of low-boiling petrol ether are added, and the stoppered flask is shaken continuously until a clear solution is obtained. The petrol ether which is now poured out contains/uWy adds and cholesterol, whereas the bile acids formerly in solution in the ether have separated as a thick resinous mass. In order to separate the fatty acids and the cholesterol the petrol ether solution is carefully shaken with 50 to 60 c.c. of 2iV-potas-sium hydroxide solution. This solution is added in 10 c.c. portions, and each portion is at once removed so as to avoid emulsions. 

Phenyl-1 -(5 -tetrazoly 1)-1 -tetrazene, 2804 N-Phenyl-1,2,3,4-thiatriazolamine, 2729 Potas shun 3,5 -dinitro -2(1 -tetrazeny l)phenoxide Sodium 5-azidotetrazolide, 0551... 

Dissolve a mixture of 40 parts by weight of ferric itrate, 5 parts of nickel nitrate, and 5 parts of chromium itrate, all free from chlorine Precipitate with potas-um carbonate, filter, wash, form into masses and dry. ... 

Beginning in the 1700s and beyond, scientists suspected that an unknown metal existed in alum. Alum is found in the form of several compounds—for example, aluminum ammonium sulfate [A1NH IS0 )j 12H20], aluminum potassium sulfate [AlK(SO )2 12HjO], or aluminum sulfate [Alj(SO ) j]. The scientists problem was that they had no techniques or knowledge of how to extract the metal from its ore until 1825 when the Danish chemist Hans Christian Oersted (1777-1851) isolated a very small amount of aluminum by melting alum with potas-... 

Nay, B. et al.. Total synthesis of labeled flavonoids. 2. C-labeled ( )-catechin from potas-sium[ C]cyanide, Eur. J. Org. Chem., 1279, 2000. 

The potassium hydroxide may be added to the water in one po S tion, but the resulting base solution should be allowed to cool to nearl li room temperatiu-e before adding to the reaction mixture. If the potas sium hydroxide solution is cooled much below ambient temperature, the potassium hydroxide begins to separate hot potassium hydroxide solution could cause the tetrahydrofuran solution to boil. 

---