B Name this alkanoic acid.

Ester name ethanoate. Identify and name the acid part of the ester. FIRST The carbon chain from the acid with ate ending. The most commonly discussed ester is ethyl ethanoate.

Esters feature a carbon-to-oxygen double bond that is also singly bonded to a second oxygen atom which is then joined to an alkyl or an aryl group. Thus CH 3 COOC 2 H 5 is named ethyl ethanoate by the rules laid down for IUPAC nomenclature for esters. The commonest ester you will come across is ethyl ethanoate.

Notice that the ester is named the opposite way around from the way the formula is written. An alkyl group in green is attached directly to the oxygen atom by its middle carbon atom. The ester is therefore butyl propionate or butyl propanoate.

The esters shown here are ethyl acetate a and methyl butyrate b. Esters are known for their distinctive odors and are commonly used for food aroma and fragrances. In this case the hydrogen in the -COOH group has been replaced by an ethyl group.

I have colour-coded the structure and name to show how they are related. The most commonly discussed ester is ethyl ethanoate. A Identify the alkyl group that has replaced the H of the carboxylate group.

In this case the hydrogen in the -COOH group has been replaced by an ethyl group. Structural Formula Of Ester Ethyl Ethanoate Substituted carboxylic acids are named either by the iupac system or by common names. A Identify the alkyl chain making up the carboxylic acid.