Tổng Hợp Dầu Chuối (Isoamyl Axetat)

Chế tạo este tạo ra hương vị chuối

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

Mục tiêu

Tổng hợp isoamyl axetat (dầu chuối) qua este hóa Fischer của axit axetic và ancol isoamyl, minh họa cách các este tạo ra hương vị trái cây.

Bối cảnh

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.

Cảnh báo an toàn

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

PPE cần thiết

goggles gloves lab_coat

Vật liệu

  • 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

Thiết bị

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

Quy trình

1

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

3 phút Fume hood required
2

Slowly add 1 mL concentrated H₂SO₄ as catalyst.

2 phút Add very slowly — exothermic
3

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

60 phút Ensure condenser water flows
4

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

3 phút
5

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

5 phút CO₂ produced — vent
6

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

12 phút Waft — do not sniff directly
7

Calculate the yield and record the banana-like aroma.

5 phút

Kết quả dự kiến

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.

Dọn dẹp

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

Frequently Asked Questions

What is the objective of Tổng Hợp Dầu Chuối (Isoamyl Axetat)?
Tổng hợp isoamyl axetat (dầu chuối) qua este hóa Fischer của axit axetic và ancol isoamyl, minh họa cách các este tạo ra hương vị trái cây.
How difficult is Tổng Hợp Dầu Chuối (Isoamyl Axetat)?
This experiment is rated as Advanced (University). It takes approximately 90 minutes to complete.
What safety precautions are needed for Tổng Hợp Dầu Chuối (Isoamyl Axetat)?
Key safety precautions include: Concentrated H₂SO₄ is extremely corrosive; Glacial acetic acid causes burns; Isoamyl alcohol is flammable.
What materials are needed for Tổng Hợp Dầu Chuối (Isoamyl Axetat)?
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 Tổng Hợp Dầu Chuối (Isoamyl Axetat)?
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.