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Nomenclature of Anhydrides

The acid anhydride functional group results when two carboxylic acids combine and lose water (anhydride = without water).  Symmetrical acid anhydrides are named like carboxylic acids except the ending -acid is replaced with -anhydride. This is true for both the IUPAC and Common nomenclature.

Symmetrical anhydrides

Nomen1.jpg

Unsymmetrical acid anhydrides

Unsymmetrical acid anhydrides are named by first naming each component carboxylic acid alphabetically arranged (without the word acid) followed by spaces and then the word anhydride.

Nomen2.jpg

 

propanoic anhydride

ethanoic propanoic anhydride

Try to name the following compound

J

Try to draw a structure for the following compound�

  • 1,2-benzenedicarboxylic anhydride J

Common names that you should know

acetic anhydride (Try to name this anhydride by the proper name. J )

succinic anhydride (Try to name this anhydride by the proper name. J )

Contributors

Prof. Steven Farmer (Sonoma State University)