Synthese von Bananenaroma (Isoamylacetat)

Herstellung des für den Bananengeschmack verantwortlichen Esters

Organic Synthesis Advanced (University) 90 Min. ~$22,00

Ziel

Isoamylacetat (Bananenaroma) durch Fischer-Veresterung von Essigsäure und Isoamylalkohol synthetisieren und demonstrieren, wie Ester Fruchtaromen erzeugen.

Hintergrund

Isoamyl acetate is the ester responsible for the characteristic smell of bananas. It is synthesized by the acid-catalyzed reaction of isoamyl alcohol with acetic acid. This experiment demonstrates ester formation, liquid-liquid extraction, and the connection between molecular structure and sensory properties.

Sicherheitswarnungen

  • Concentrated H₂SO₄ is extremely corrosive
  • Glacial acetic acid causes burns
  • Isoamyl alcohol is flammable
  • Work in a fume hood throughout

Erforderliche PSA

goggles gloves lab_coat

Materialien

  • Isoamyl alcohol (3-methyl-1-butanol) (5 mL)
  • Glacial acetic acid (7 mL)
    Excess
  • Sulfuric acid (H₂SO₄) (1 mL)
    Concentrated, catalyst
  • Sodium bicarbonate solution (50 mL)
    5%
  • Anhydrous sodium sulfate (5 g)
    Drying agent

Ausrüstung

Round-bottom flask (100 mL) Reflux condenser Heating mantle Separating funnel Boiling chips

Durchführung

1

Add 5 mL isoamyl alcohol and 7 mL glacial acetic acid to the round-bottom flask with boiling chips.

3 Min. Fume hood required
2

Slowly add 1 mL concentrated H₂SO₄ as catalyst.

2 Min. Add very slowly — exothermic
3

Attach reflux condenser and heat at gentle reflux for 60 minutes.

60 Min. Ensure condenser water flows
4

Cool and transfer to a separating funnel. Add 25 mL water and shake.

3 Min.
5

Wash the organic layer with 25 mL of 5% NaHCO₃. Vent frequently.

5 Min. CO₂ produced — vent
6

Dry the organic layer over Na₂SO₄ for 10 minutes. Filter and smell by wafting.

12 Min. Waft — do not sniff directly
7

Calculate the yield and record the banana-like aroma.

5 Min.

Erwartete Ergebnisse

A clear, pale yellow liquid with a strong banana aroma (isoamyl acetate). Typical yield is 50-65%. The unmistakable banana smell confirms successful ester formation.

Aufräumen

Dispose of organic waste in designated containers. Neutralize acid waste. Rinse glassware with acetone then water.

Details

Kategorie
Organic Synthesis
Schwierigkeit
Advanced (University)
Dauer
90 Min.
Geschätzte Kosten
$22,00
Schritte
7
Materialien
5

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Frequently Asked Questions

What is the objective of Synthese von Bananenaroma (Isoamylacetat)?
Isoamylacetat (Bananenaroma) durch Fischer-Veresterung von Essigsäure und Isoamylalkohol synthetisieren und demonstrieren, wie Ester Fruchtaromen erzeugen.
How difficult is Synthese von Bananenaroma (Isoamylacetat)?
This experiment is rated as Advanced (University). It takes approximately 90 minutes to complete.
What safety precautions are needed for Synthese von Bananenaroma (Isoamylacetat)?
Key safety precautions include: Concentrated H₂SO₄ is extremely corrosive; Glacial acetic acid causes burns; Isoamyl alcohol is flammable.
What materials are needed for Synthese von Bananenaroma (Isoamylacetat)?
The main materials required are: Isoamyl alcohol (3-methyl-1-butanol), Glacial acetic acid, Sulfuric acid (H₂SO₄), Sodium bicarbonate solution, Anhydrous sodium sulfate.
What results should I expect from Synthese von Bananenaroma (Isoamylacetat)?
A clear, pale yellow liquid with a strong banana aroma (isoamyl acetate). Typical yield is 50-65%. The unmistakable banana smell confirms successful ester formation.