Formation of the ester ethyl propanoate from a carboxylic acid

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Esters C.I What are they? How are they made? Formed when an alcohol reacts with a carboxylic acid. Very slow reaction, unless! an acid catalyst.

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Presentation transcript:

Formation of the ester ethyl propanoate from a carboxylic acid

An acid anhydride is formed by removal of a molecule of water from two carboxylic acid molecules. 2

Ethanoic anhydride reacts with methanol to make the ester methyl ethanoate 3

Esters Describe the esterification of carboxylic acids with alcohols in the presence of an acid catalyst, and also of acid anhydrides with alcohols. Describe the hydrolysis of esters. State the uses of esters in perfumes and flavourings.

Acid hydrolysis of propyl ethanoate 5

Alkaline hydrolysis of ethyl propanoate 6

Wintergreen - ester methyl salicylate 7

Benzyl ethanoate 8