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Naming Esters. Esters (R-CO-O-R') are named as alkyl derivatives of carboxylic acids. The alkyl (R') group is named first. The R-CO-O part is then named as a separate word based on the carboxylic acid name, with the ending changed from  -oic acid  to  -oate . Alcohol  component

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Presentation Transcript
slide2
Esters (R-CO-O-R') are named as alkyl derivatives of carboxylic acids.
  • The alkyl (R') group is named first.
  • The R-CO-O part is then named as a separate word based on the carboxylic acid name, with the ending changed from  -oic acid to -oate.
slide3
Alcohol component
    • the root name is based on the longest chain containing the -OH group.
    • The chain is numbered so the -OH has the lowest possible number.
  • Carboxylic acid component
    • the root name is based on the longest chain including the carbonyl group.
    • Since the carboxylic acid group is at the end of the chain, it must be C1.
    • The ester suffix for the acid component :  -ane + -oate = -anoate etc.
example
Example
  • methyl propanoate
  • An ester name has two parts - the part that comes from the acid (propanoate) and the part that shows the alkyl group (methyl).

Propanoic Acid

The hydrogen in the -COOH group is replaced by an alkyl group in this case, a methyl group.

Ester names are confusing because the name is written backwards from the way the structure is drawn

example 2
Example #2
  • Ethyl ethanoate
  • This is probably the most commonly used example of an ester. It is based on ethanoic acid (hence, ethanoate), a 2 carbon acid. The hydrogen in the -COOH group is replaced by an ethyl group.
example of acids
Example of Acids
  • HCOOH = methanoic acid
  • CH3COOH = ethanoic acid
  • CH3CH2COOH = propanoic acid
  • C3H7COOH = butanoic acid
resources
Resources
  • http://www.chemguide.co.uk/basicorg/conventions/names2.html
  • http://www.chemguide.co.uk/organicprops/esters/background.html
  • http://www.youtube.com/user/EducatorVids?v=oUMrNkiAKJ8&feature=pyv&ad=8587454348&kw=organic%20chemistry
  • http://www.chem.ucalgary.ca/courses/351/orgnom/esters/esters-01.html
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