Naming esters
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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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Naming Esters

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Naming esters

Naming Esters


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.


Naming esters

  • 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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