एसिटामिनोफेन (पेरासिटामोल) की तैयारी

एमाइड बंध निर्माण द्वारा एक दर्दनिवारक का संश्लेषण

Organic Synthesis Advanced (University) 80 मिनट ~$18.00

उद्देश्य

एमाइड बंध निर्माण प्रदर्शित करते हुए, एसिटिक एनहाइड्राइड के साथ पी-एमिनोफेनॉल के एसिटाइलेशन द्वारा एसिटामिनोफेन (पेरासिटामोल) का संश्लेषण करें।

पृष्ठभूमि

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.

सुरक्षा चेतावनियाँ

  • 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

आवश्यक PPE

goggles gloves lab_coat

सामग्री

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

उपकरण

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

प्रक्रिया

1

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

5 मिनट Handle p-aminophenol with gloves
2

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

10 मिनट Fume hood — pungent vapors
3

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

12 मिनट
4

Cool the mixture in an ice bath until crystals form.

15 मिनट
5

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

8 मिनट
6

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

15 मिनट
7

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

10 मिनट
8

Calculate percent yield.

5 मिनट

अपेक्षित परिणाम

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.

सफाई

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

Frequently Asked Questions

What is the objective of एसिटामिनोफेन (पेरासिटामोल) की तैयारी?
एमाइड बंध निर्माण प्रदर्शित करते हुए, एसिटिक एनहाइड्राइड के साथ पी-एमिनोफेनॉल के एसिटाइलेशन द्वारा एसिटामिनोफेन (पेरासिटामोल) का संश्लेषण करें।
How difficult is एसिटामिनोफेन (पेरासिटामोल) की तैयारी?
This experiment is rated as Advanced (University). It takes approximately 80 minutes to complete.
What safety precautions are needed for एसिटामिनोफेन (पेरासिटामोल) की तैयारी?
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 एसिटामिनोफेन (पेरासिटामोल) की तैयारी?
The main materials required are: p-Aminophenol, Acetic anhydride, Distilled water, Acetone.
What results should I expect from एसिटामिनोफेन (पेरासिटामोल) की तैयारी?
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.