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Ethyl acetate sulphuric acid

The rate at which an alcohol reacts with an acid to form an ester, is markedly increased when the reaction takes place in the presence of a catalytic agent. Sulphuric acid and hydrogen chloride are frequently employed for this purpose the former is usually used in the preparation of ethyl acetate. The catalytic effect of sulphuric acid is probably due to the fact that it unites with the alcohol to form ethyl sulphuric acid, which, in turn, reacts with acetic acid to form ethyl acetate. Sulphuric acid is regenerated and serves to convert more of the alcohol and acid into the ester. The equation for the reaction is as follows —... [Pg.172]

Peru Acetic anhydride, ephedrine, ergometrine, ergotamine, lysergic acid, norephedrine, potassium permanganate, pseudoephedrine, acetone, ethyl ether, hydrochloric acid, methyl ethyl ketone, sulphuric acid and toluene 27 September 1999... [Pg.72]

McjC = CHCOCH3. Colourless liquid b.p. 129"C, with a strong peppermint-like odour. Prepared by distilling diacetone alcohol in the presence of a trace of iodine. Converted to phorone by heating in propanone with dehydrating agents such as sulphuric acid. It is a solvent For cellulose acetate and ethyl-cellulose and other polymers. [Pg.255]

CH3COOH + HOC2H5 - CH3GOOC2H3 + H2O If, however, concentrated sulphuric acid is present, the water is absorbed, the back reaction prevented, and a high yield of ethyl acetate is obtained. In practice the reaction is not so simple. It was formerly supposed that, since the sulphuric acid is usually added to the alcohol, ethyl hydrogen sulphate and water are formed, the latter being absorbed by the excess of sulphuric acid, A mixture of ethanol and acetic acid is then added to the ethyl hydrogen sulphate,... [Pg.95]

Ethyl acetate. Various grades of ethyl acetate are marketed. The anhydrous comjjound, b.p. 76-77°, is of 99 per cent, purity, is inexpensive, and is suitable for most purposes. The 95-98 per cent, grade usually contains some water, ethyl alcohol and acetic acid, and may be ptuified in the following manner. A mixture of 1 litre of the commercial ethyl acetate, 100 ml. of acetic anhydride and 10 drops of concentrated sulphuric acid is refluxed for 4 hours and then fractionated. The distU-late is shaken with 20-30 g. of anhydrous potassium carbonate, filtered and redistilled. The final product has a purity of about 99-7% and boils at 77°/760 mm. [Pg.174]

Suspend 0 25 g. of 2 4-dinitrophenylhydrazine in 5 ml. of methanol and add 0-4 0-5 ml. of concentrated sulphuric acid cautiously. FUter the warm solution and add a solution of 0 1-0-2 g. of the carbonyl compound in a small volume of methanol or of ether. If no sohd separate within 10 minutes, dUute the solution carefuUy with 2N sulphuric acid. CoUect the solid by suction filtration and wash it with a little methanol. RecrystaUise the derivative from alcohol, dUute alcohol, alcohol with ethyl acetate or chloroform or acetone, acetic acid, dioxan, nitromethane, nitrobenzene or xylene. [Pg.344]

Ethyl acetate. Use 58 g. (73-5 ml.) of absolute ethyl alcohol, 225 g. of glacial acetic acid and 3 g. of concentrated sulphuric acid. Reflux for 6-12 hours. Work up as for n-propyl acetate. B.p. 76- 77°. Yield 32 g. Much ethyl acetate is lost in the washing process. A better yield may be obtained, and most of the excess of acetic acid may be recovered, by distilhng the reaction mixture through an efficient fractionating column and proceeding as for methyl acetate. [Pg.383]

Ethyl n-butyrate. Use a mixture of 88 g. (92 ml.) of n-butyric acid, 23 g. (29 ml.) of ethanol and 9 g. (5 ml.) of concentrated sulphuric acid. Reflux for 14 hours. Pour into excess of water, wash several times with water, followed by saturated sodium bicarbonate solution until all the acid is removed, and finally with water. Dry with anhydrous magnesium sulphate, and distU. The ethyl n-but3rrate passes over at 119 5-120-5°, Yield 40 g. An improved yield can be obtained by distilhng the reaction mixture through an efficient fractionating column until the temperature rises to 125°, and purifying the crude ester as detailed above under methyl acetate. [Pg.383]

Indanedioiie (III) may also be prepared by condensation of diethyl phthalate (V) with ethyl acetate in the presence of sodium ethoxide the resulting sodium 1 3-indanedione-2-carboxylic ester (VI) upon warming with sulphuric acid yields (HI). [Pg.994]

Method B. Place 125 g. (106 -5 ml.) of diethyl phthalate and 25 g. of molecular sodium (sodium sand see Section 11,50,6) in a 500 ml. round-bottomed flask fitted with a reflux condenser and dropping funnel. Heat the flask on a steam bath and add a mixture of 122 5 g. (136 ml.) of dry ethyl acetate and 2 5 ml. of absolute ethanol over a period of 90 minutes. Continue the heating for 6 hours, cool and add 50 ml. of ether. Filter the sodium salt (VI) on a sintered glass funnel and wash it with the minimum volume of ether. Dissolve the sodium salt (96 g.) in 1400 ml. of hot water in a 3-htre beaker, cool the solution to 70°, stir vigorously and add 100 ml. of sulphuric acid (3 parts of concentrated acid to 1 part of... [Pg.994]

Reactions.—Add a few drops of alcohol to the same quantity of apetic acid, and an equal volume of concentrated sulphuric acid. Warm gently and notice the fruity smell of ethyl acetate. Neutralise a few drops of acetic acid by adding e.xcess of ammonia and boiling until neutral. Let cool and add a drop of ferric chloride. The red colour of ferric acetate is produced On boiling, basic ferric acetate is precipitated. [Pg.74]

The reaction is a sensitive one, but is subject to a number of interferences. The solution must be free from large amounts of lead, thallium (I), copper, tin, arsenic, antimony, gold, silver, platinum, and palladium, and from elements in sufficient quantity to colour the solution, e.g. nickel. Metals giving insoluble iodides must be absent, or present in amounts not yielding a precipitate. Substances which liberate iodine from potassium iodide interfere, for example iron(III) the latter should be reduced with sulphurous acid and the excess of gas boiled off, or by a 30 per cent solution of hypophosphorous acid. Chloride ion reduces the intensity of the bismuth colour. Separation of bismuth from copper can be effected by extraction of the bismuth as dithizonate by treatment in ammoniacal potassium cyanide solution with a 0.1 per cent solution of dithizone in chloroform if lead is present, shaking of the chloroform solution of lead and bismuth dithizonates with a buffer solution of pH 3.4 results in the lead alone passing into the aqueous phase. The bismuth complex is soluble in a pentan-l-ol-ethyl acetate mixture, and this fact can be utilised for the determination in the presence of coloured ions, such as nickel, cobalt, chromium, and uranium. [Pg.684]

Chromatographic characterisation of hydrolysis products Hydrolysis products from sodium polypectate were analysed by thin-layer chromatography on silica gel G-60, using ethyl acetate / acetic acid / formic acid / water (9 3 1 4, by volume) as the mobile phase system. Sugars were detected with 0,2% orcinol in sulphuric add-methanol (10 90ml) [14]. [Pg.788]

Decant the liquid layer into a 2 6 litre flask, and dissolve the sodium derivative of acetylacetone in 1600 ml. of ice water transfer the solution to the flask. Separate the impure ethyl acetate layer as rapidly as possible extract the aqueous layer with two 200 ml. portions of ether and discard the ethereal extracts. Treat the aqueous layer with ice-cold dilute sulphuric acid (100 g. of concentrated sulphuric acid and 270 g. of crushed ice) until it is just acid to litmus. Extract the diketone from the solution with four 200 ml. portions of ether. Leave the combined ether extracts standing over 40 g. of anhydrous sodium sulphate (or the equivalent quantity of anhydrous magnesium sulphate) for 24 hours in the ice chest. Decant the ether solution into a 1500 ml. round-bottomed flask, shake the desiccant with 100 ml. of sodium-dried ether and add the extract to the ether solution. Distil off the ether on a water bath. Transfer the residue from a Claisen flask with fractionating side arm (Figs. II, 24, 4-6) collect the fraction boiling between 130° and 139°. Dry this over 6 g. of anhydrous potassium carbonate, remove the desiccant, and redistil from the same flask. Collect the pure acetylacetone at 134-136°. The yield is 86 g. [Pg.864]

Sulphuric acid ethylene glycol, ethyl acetate, methyl acetate or furfural Chlorates, perchlorates, permanganates... [Pg.165]

Franchimont and Klobbie [17] prepared ethylenedinitramine (EDNA, Haleite) by the nitration of ethylene urea (2-imidazolidone) with a mixture of nitric and sulphuric acids. (According to Schweitzer [18], ethylene urea is obtainable either by the action of urea on ethylenediamine at 110°C (initially) to 240-250°C (finally) in quantitative yield or by the action of urea on ethylene glycol at 160-240°C in 55% yield. W. E. Bachmann et al. [19] prepared ethylene urea by the action of ethyl carbonate on ethylenediamine in approximately 60% yield.) Hydrolysis of the dinitroethy-lene urea so formed gives ethylenedinitramine. Bachmann recommends nitration with mixed nitric acid and acetic anhydride ... [Pg.18]


See other pages where Ethyl acetate sulphuric acid is mentioned: [Pg.177]    [Pg.168]    [Pg.96]    [Pg.97]    [Pg.482]    [Pg.878]    [Pg.80]    [Pg.138]    [Pg.229]    [Pg.506]    [Pg.512]    [Pg.82]    [Pg.82]    [Pg.910]    [Pg.18]    [Pg.111]    [Pg.800]    [Pg.111]    [Pg.230]    [Pg.482]    [Pg.878]    [Pg.1432]    [Pg.141]    [Pg.354]   
See also in sourсe #XX -- [ Pg.50 , Pg.107 ]

See also in sourсe #XX -- [ Pg.40 , Pg.43 ]




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