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E. A. STER. John Kevin R. Alberto IV – BSCT Advance Organic Chemistry. Flow of discussion. 1. What is an ester?. 2. Esters’ nomenclature. 3. Preparation of esters (reaction). 4. Discussion of journal. eSTERS. Are chemical compounds consisting of a carbonyl adjacent to an Ether linkage.

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  1. E A STER John Kevin R. Alberto IV – BSCT Advance Organic Chemistry

  2. Flow of discussion 1. What is an ester? 2. Esters’ nomenclature 3. Preparation of esters (reaction) 4. Discussion of journal

  3. eSTERS • Are chemical compounds consisting of a carbonyl adjacent to an Ether linkage. • They are derived by reacting an oxoacid with a hydroxyl compound .

  4. are ubiquitous, they are present fats and oils, pheromones, fragrances, DNA, explosives, and plastics.

  5. Nomenclature • Esters are one of a number of compounds known collectively as ACID DERIVATIVES.

  6. In an ester, the hydrogen in the -COOH group is replaced by an alkyl group (or possibly some more complex hydrocarbon group).

  7. Example 1: Methyl Propanoate Propanoic Acid

  8. The hydrogen in the -COOH group is replaced by an alkyl group - in this case, a methyl group.

  9. Try this

  10. 1.) • Methyl formate (C2H4O2) • Methyl methanoate • 2.) • Methyl propanoate (C4H8O2) • Methyl propionate

  11. 3.) • PropylFormate (C4H8O2) • PropylMethanoate • 4.) • Ethyl ethanoate (C4H8O2) • Ethyl acetate

  12. Preparation of esters Alcoholysis of acyl chlorides and acid anhydides. Alcohols react with acyl chlorides and acid anhydrides to give esters: RCOCl + R'OH → RCO2R' + HCl (RCO)2O + R'OH → RCO2R' + RCO2H

  13. Transesterification Transesterification, which involves changing one ester into another one, is widely practiced: RCO2R' + CH3OH → RCO2CH3 + R'OH

  14. Carbonylation Alkenes undergo "hydroesterification" in the presence of metal carbonyl catalysts. Esters of propionic acid are produced commercially by this method: C2H4 + ROH + CO → C2H5CO2R

  15. Discussion of Journal KINETIC AND MECHANISTIC STUDY OF OXIDATION OF ESTER BY K2Cr2O7 Keywords: Kinetics (Chemical) 2. Carl ‐ Zeiss spectrophotometer.

  16. Why? We found out that the oxidation of esters occurs in two ways: Hydrolysis followed by the oxidation of alcohol, or direct oxidation of esters. What? No conclusive evidence was provided iin support of either of the two pathways.

  17. Carl – Zeiss spectrophoptometer

  18. Reference: • www.chemguide.co.uk/ester#1 2272/vqw?.html • www.wikipedia.org/ester

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