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What are esters?. Esters have characteristic smells, and are often used in flavourings and perfumes. For example: propyl ethanoate smells of pears butyl butanoate smells of pineapple methyl butanoate smells of apple. Esters. Esters contain this group of atoms:. - PowerPoint PPT Presentation
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© Boardworks Ltd 20092 of 6
What are esters?
Esters have characteristic smells, and are often used in flavourings and perfumes.
For example:
propyl ethanoate smells of pears
butyl butanoate smells of pineapple
methyl butanoate smells of apple.
© Boardworks Ltd 20093 of 6
Esters
Esters contain this group of atoms:
Esters are made from the reaction of a carboxylic acid with an alcohol:
...which is written as –COO–.
carboxylic acid + alcohol ester + water
+ +
+ +CH3CH2COOH CH3OH H2OCH3CH2COOCH3
propanoic acid methanol methyl propanoate water+ +
© Boardworks Ltd 20094 of 6
Naming esters
Esters are named after the alcohol and the carboxylic acid from which they are made. The alcohol gives the first part of the name, and the carboxylic acid gives the second. Esters always end in “–anoate”.
ethanoic acid methanol
methyl ethanoate
For example: