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What are esters? - PowerPoint PPT Presentation


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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:.

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what are esters
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

Esters contain this group of atoms:

...which is written as –COO–.

Esters are made from the reaction of a carboxylic acid with an alcohol:

carboxylic acid+ alcohol  ester +water

propanoic acid

methanol

methylpropanoate

+

water

+

CH3CH2COOH

+

CH3OH

CH3CH2COOCH3

+

H2O

+

+

naming esters
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”.

For example:

ethanoic acid

methanol

methylethanoate