Синтез бананового масла (изоамилацетата)

Получение эфира, отвечающего за банановый аромат

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

Цель

Синтезировать изоамилацетат (банановое масло) реакцией Фишера уксусной кислоты с изоамиловым спиртом, показав, как сложные эфиры создают фруктовые ароматы.

Предпосылки

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.

Предупреждения по безопасности

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

Требуемые СИЗ

goggles gloves lab_coat

Материалы

  • 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

Оборудование

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

Процедура

1

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

3 мин Fume hood required
2

Slowly add 1 mL concentrated H₂SO₄ as catalyst.

2 мин Add very slowly — exothermic
3

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

60 мин Ensure condenser water flows
4

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

3 мин
5

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

5 мин CO₂ produced — vent
6

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

12 мин Waft — do not sniff directly
7

Calculate the yield and record the banana-like aroma.

5 мин

Ожидаемые результаты

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.

Уборка

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

Frequently Asked Questions

What is the objective of Синтез бананового масла (изоамилацетата)?
Синтезировать изоамилацетат (банановое масло) реакцией Фишера уксусной кислоты с изоамиловым спиртом, показав, как сложные эфиры создают фруктовые ароматы.
How difficult is Синтез бананового масла (изоамилацетата)?
This experiment is rated as Advanced (University). It takes approximately 90 minutes to complete.
What safety precautions are needed for Синтез бананового масла (изоамилацетата)?
Key safety precautions include: Concentrated H₂SO₄ is extremely corrosive; Glacial acetic acid causes burns; Isoamyl alcohol is flammable.
What materials are needed for Синтез бананового масла (изоамилацетата)?
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 Синтез бананового масла (изоамилацетата)?
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.