アセトアミノフェン(パラセタモール)の調製

アミド結合形成による鎮痛剤の合成

Organic Synthesis Advanced (University) 80 分 ~$18.00

目的

無水酢酸によるp-アミノフェノールのアセチル化でアセトアミノフェン(パラセタモール)を合成し、アミド結合形成を実証する。

背景

Acetaminophen is one of the world's most widely used over-the-counter analgesics. Its synthesis involves the reaction of p-aminophenol with acetic anhydride to form an amide bond. The reaction is selective for the amine group over the phenol group under mild conditions.

安全上の警告

  • Acetic anhydride is corrosive and has a strong odor
  • p-Aminophenol can cause skin irritation
  • Do not consume the product
  • Work in a fume hood

必要なPPE

goggles gloves lab_coat

材料

  • p-Aminophenol (1.5 g)
  • Acetic anhydride (2 mL)
    Corrosive
  • Distilled water (100 mL)
    Ice-cold for crystallization
  • Acetone (10 mL)
    For recrystallization

器具

250 mL Erlenmeyer flask Hot water bath Buchner funnel Filter flask Melting point apparatus Ice bath

手順

1

Dissolve 1.5 g p-aminophenol in 15 mL distilled water in the Erlenmeyer flask. Warm gently if needed.

5 分 Handle p-aminophenol with gloves
2

Add 2 mL acetic anhydride to the solution. Stir vigorously for 10 minutes.

10 分 Fume hood — pungent vapors
3

Heat the mixture in a water bath at 70°C for 10 minutes to complete the reaction.

12 分
4

Cool the mixture in an ice bath until crystals form.

15 分
5

Collect crude product by vacuum filtration. Wash with cold water.

8 分
6

Recrystallize from hot water or acetone/water mixture. Cool slowly for larger crystals.

15 分
7

Collect purified crystals. Dry and determine melting point (pure: 168-170°C).

10 分
8

Calculate percent yield.

5 分

予想される結果

White crystalline solid with melting point 167-170°C. Typical yield is 70-85%. The product should be pure white; discoloration indicates impurities from p-aminophenol oxidation.

後片付け

Do not consume the product. Dispose of organic waste properly. Rinse all glassware.

Frequently Asked Questions

What is the objective of アセトアミノフェン(パラセタモール)の調製?
無水酢酸によるp-アミノフェノールのアセチル化でアセトアミノフェン(パラセタモール)を合成し、アミド結合形成を実証する。
How difficult is アセトアミノフェン(パラセタモール)の調製?
This experiment is rated as Advanced (University). It takes approximately 80 minutes to complete.
What safety precautions are needed for アセトアミノフェン(パラセタモール)の調製?
Key safety precautions include: Acetic anhydride is corrosive and has a strong odor; p-Aminophenol can cause skin irritation; Do not consume the product.
What materials are needed for アセトアミノフェン(パラセタモール)の調製?
The main materials required are: p-Aminophenol, Acetic anhydride, Distilled water, Acetone.
What results should I expect from アセトアミノフェン(パラセタモール)の調製?
White crystalline solid with melting point 167-170°C. Typical yield is 70-85%. The product should be pure white; discoloration indicates impurities from p-aminophenol oxidation.