1 / 21

STER

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.

raheem
Télécharger la présentation

STER

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related