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esther

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Transcript

  • 1. 2.0 CARBON COMPOUNDS 2.7 ANALYSING ESTERS
  • 2. ESTERS Natural Sources & uses in daily life Functional Group General Formula Naming Esters & molecular Formula Structure Formulae Preparation in lab Physical Properties Of Ethyl Ethanoate 1 7 6 2 3 8 4 5 Esterification reactions
  • 3. 1.0 General Formula C n H 2n+1 COOC m H 2m+1 n = 0, 1, 2, …. m = 1, 2, 3, …. Eg. O H H H -- C--O--C--C—H H H HOC m H 2m+1 m = 1, 2, 3, …. ( alcohol ) C n H 2n+1 COOH n = 0, 1, 2, 3, …. ( Carboxylic acid ) + Ethyl methanoate
  • 4. 2.0 Functional Group Carboxylate Group -- COO -- Eg. O R--- C---O--- R
  • 5. 3.0 Naming & Molecular Formula Ethanol + ethanol acid  ethyl ethanoate
  • 6. 4.0 Structure Formulae O H H H -- C--O--C--C--H H H Ethyl methanoate
  • 7. 5.0 Preparation in lab Ethyl methanoate O O H 2 SO 4 R-- C--O--H + H--O-- R’ R --C--O-- R’ + H 2 O Carboxylic acid alcohol ESTER water
  • 8. 6.0 Physical Properties Of Ethyl Ethanoate Boiling point lower than carboxylic acid Colourless liquids Sweet pleasant smell Dissolve in organic solvents Slightly soluble in water
  • 9. 7.0 Esterification reactions Ethyl methanoate O O H -- C--O--H + H--O--CH 3 H--C--O--CH3 + H 2 O methanoic acid + methanol methyl methanoate + water
  • 10. 8.0 Natural sourcer of esters & Uses in daily life Uses : n-pentyl ethanoate / CH3COOC5H11 – bananas flavour Sourcers : Fruits & flower
  • 11. Finish…
    • Thank you.
    • bye..bye…