एल्डोल संघनन (डाइबेंजेलएसीटोन)
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सनस्क्रीन में उपयोग किए जाने वाले UV-अवशोषक यौगिक का संश्लेषण
उद्देश्य
कार्बन-कार्बन बंध निर्माण प्रदर्शित करते हुए, बेंजेल्डिहाइड और एसीटोन के बीच एक क्रॉस एल्डोल संघनन के माध्यम से डाइबेंजेलएसीटोन का संश्लेषण करें।
पृष्ठभूमि
The aldol condensation is one of the most important carbon-carbon bond-forming reactions in organic chemistry. Dibenzalacetone is formed by the double aldol condensation of benzaldehyde with acetone under basic conditions. The bright yellow product absorbs UV light and was once used in sunscreen formulations.
सुरक्षा चेतावनियाँ
- NaOH is corrosive
- Benzaldehyde is an irritant with a strong almond odor
- Acetone is flammable
- Work in a fume hood
आवश्यक PPE
सामग्री
-
Benzaldehyde (5 mL)Fresh, not oxidized
-
Acetone (1.5 mL)
-
Sodium hydroxide (NaOH) (25 mL)10% solution
-
Ethanol (20 mL)95%
-
Distilled water (100 mL)Ice-cold
उपकरण
प्रक्रिया
Dissolve 5 mL benzaldehyde in 20 mL ethanol in the Erlenmeyer flask.
Add 1.5 mL acetone to the flask and stir.
Slowly add 25 mL of 10% NaOH while stirring. A yellow precipitate should begin forming.
Stir the mixture at room temperature for 30 minutes.
Cool the flask in an ice bath for 10 minutes to maximize crystallization.
Collect the yellow crystals by vacuum filtration. Wash with cold water.
Dry the product and determine the melting point (pure dibenzalacetone: 110-112°C).
Calculate the percent yield.
अपेक्षित परिणाम
Bright yellow crystals with a melting point of 109-112°C. Typical yield is 60-80%. The product absorbs UV light strongly, which can be confirmed if a UV lamp is available.
सफाई
Dispose of organic waste in designated containers. Neutralize NaOH waste. Rinse all glassware.
विवरण
- श्रेणी
- Organic Synthesis
- कठिनाई
- Advanced (University)
- अवधि
- 75 मिनट
- अनुमानित लागत
- $18.00
- चरण
- 8
- सामग्री
- 5