20 4 condensation reactions
This presentation is the property of its rightful owner.
Sponsored Links
1 / 12

20.4 Condensation Reactions PowerPoint PPT Presentation


  • 57 Views
  • Uploaded on
  • Presentation posted in: General

20.4.1 Describe, using equations, the reactions of alcohols with carboxylic acids to form esters, and state the uses of esters. 20.4.2 Describe, using equations, the reactions of amines with carboxylic acids.

Download Presentation

20.4 Condensation Reactions

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


20 4 condensation reactions

20.4.1 Describe, using equations, the reactions of alcohols with carboxylic acids to form esters, and state the uses of esters.

20.4.2 Describe, using equations, the reactions of amines with carboxylic acids.

20.4.3 Deduce the structures of the polymers formed in the reactions of alcohols with carboxylic acids.

20.4.4 Deduce the structures of the polymers formed in the reactions of amines with carboxylic acids.

20.4.5 Outline the economic importance of condensation reactions.

20.4 Condensation Reactions


Condensation reaction

Condensation Reaction

  • Occurs when two molecules react to form a product with the loss of a small molecule.

  • Also called addition-elimination reactions

  • Responsible for:

    • Esterfication

    • Polymerization

      • Polyesters

      • Polyamides


Esterfication

Esterfication

  • Type of condensation reaction

  • Reaction of alcohol with carboxylic acid to make an ester and water.

  • Conditions:warming the mixture in the presence of concentrated H2SO4 catalyst.

    • Catalyst speeds up reaction and improves yield of the equilibrium


Two examples

Two examples:

  • Ethanoic acid + methanol < -- > methyl ethanoate + water

  • CH3COOH + CH3OH < -- > CH3COOCH3 + H2O

  • So, the OH is taken from the carboxylic acid and the H is removed from the alcohol and combine to make H2O, then the two molecules combine where their bonds were broken

2.


Polyesters

Polyesters

Are polymers of esters.

Can form when the acid and the alcohol forming the ester has 2 functional groups each.

All polymers are formed with the monomers (units) having 2 functional groups, which have active ends for linking together in a chain.


Pet synthetic fibres and production of plastic bottles

PET: synthetic fibres and production of plastic bottles


Ib requires

IB requires

Can you recognize the repeating unit?

Polyester formed (PET) from ethane-1,2-diol and benzene-1,4-dicarboxylic acid


Condensation reaction to form amides

Condensation reaction to form amides

Carboxylic acid + primary amine  secondary amide + water

Ethanoic acid + methanamine  methylethanamide + water

CH3COOH + CH3NH2  CH3CONH(CH3) + H2O


Polyamides

Polyamides

  • Proteins are examples of polyamides.

  • Polymer that contains an amide link.

  • Synthetic polyamides are nylon and Kevlar.

  • Form when the monomers each have 2 functional groups.

  • One monomer has two –COOH groups (carboxylic acid) and the other monomer has two –NH2 groups (amine)

  • IB Required example:

    • 1,6-diaminohexane + hexanedioic acid producing 6,6-nylon (b/c its monomers each have 6 carbons)


20 4 condensation reactions

Adipic acid = hexanedioic acid


Importance of condensation reactions

Importance of condensation reactions

We are very much dependant upon plastics, synthetic fibres such as nylon, kevlar...

Commercial production of such materials has changed our world.


Sources

Sources

http://www.elmhurst.edu/~chm/vchembook/402condensepolymers.html


  • Login