Organic 2 Review Problem 111

Organic 2 Review Problem 111 - P REPARATIONS 95 cooling,...

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PREPARATIONS 95 cooling, making strongly alkaline, and treating with Fehling's solution. A deep yellow precipitate of cuprous oxide results: 2HONH 2 + 4 CuO = 2Cu 2 O + N 2 O + 3 H 2 O Esters. Esters may be prepared by the following methods: (i) Directly from the corresponding acid and alcohol, in the presence of a dehydrating agent. Thus when ethanol and acetic acid are mixed, ethyl acetate and water are formed, but in addition an equilibrium is established. CH 3 COOH + HOC 2 H 5 - CH 3 COOC 2 H 5 + H 2 O 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, C 2 H 5 OH + H 2 SO
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This note was uploaded on 09/19/2011 for the course CHM 2211 taught by Professor Castalleano during the Fall '06 term at University of Florida.

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