एसिटामिनोफेन (पेरासिटामोल) की तैयारी
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एमाइड बंध निर्माण द्वारा एक दर्दनिवारक का संश्लेषण
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
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
प्रक्रिया
Dissolve 1.5 g p-aminophenol in 15 mL distilled water in the Erlenmeyer flask. Warm gently if needed.
Add 2 mL acetic anhydride to the solution. Stir vigorously for 10 minutes.
Heat the mixture in a water bath at 70°C for 10 minutes to complete the reaction.
Cool the mixture in an ice bath until crystals form.
Collect crude product by vacuum filtration. Wash with cold water.
Recrystallize from hot water or acetone/water mixture. Cool slowly for larger crystals.
Collect purified crystals. Dry and determine melting point (pure: 168-170°C).
Calculate percent yield.
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.
विवरण
- श्रेणी
- Organic Synthesis
- कठिनाई
- Advanced (University)
- अवधि
- 80 मिनट
- अनुमानित लागत
- $18.00
- चरण
- 8
- सामग्री
- 4