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Esters. Formal Lab. Chemistry Joke. Q: Why is uranium my favorite element? A: Because I love U!!. What are Esters?. Esters belong to a group of organic compounds called carbonyl compounds. A carbonyl compound contains a C double-bonded to an O (C=O).

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esters

Esters

Formal Lab

chemistry joke
Chemistry Joke

Q: Why is uranium my favorite element?

A: Because I love U!!

what are esters
What are Esters?
  • Esters belong to a group of organic compounds called carbonyl compounds.
  • A carbonyl compound contains a C double-bonded to an O (C=O).
  • Esters have characteristic odors associated with flavoring and scents.
  • We will be synthesizing esters having the specific odors of banana, wintergreen, pineapple, apple, and orange.
formula of an ester
Formula of an Ester
  • The general formula is
  • R and R’ are symbols used to designate alkyl groups. The methyl and ethyl groups are examples.
how are esters synthesized
How are Esters Synthesized?
  • Esters are prepared from the condensation (removal of water) of a carboxylic acid and an alcohol.
  • A strong acid, such as sulfuric, is used as a catalyst.
example
Example
  • Notice that the acid is drawn with the OH on the left to show that it combines with the H of the alcohol to form water.
naming an ester
Naming an Ester

Alkyl Designation

  • 1 C: meth-
  • 2 C: eth-
  • 3 C: prop-
  • 4 C: but-
  • 5 C: pent-
  • 6 C: hex-
  • 7 C: hept-
  • 8 C: oct-
  • 1. Remove the –anolsuffix from the name of the alcohol and change it to the corresponding alkyl designation.
    • Ethanol becomes ethyl
    • Propanol becomes propyl
  • 2. Remove the –ic acid suffix and replace it with –ate.
    • Ethanoic acid becomes ethanoate
    • Propanoic acid becomes propanoate
naming an ester1
Naming an Ester
  • So, the ester formed from condensing methanol and propanoic acid would be called methyl propanoate.
  • Some organic compounds have common names that are used instead of their IUPAC system name in the same way that H2O is not dihydrogen monoxide, but water.
chemistry joke1
Chemistry Joke

I asked my Spanish teacher if silicon had the same name in Spanish???

She said…

“Si!”