Aldol Kondenzasyonu (Dibenzalaseton)

Güneş kremlerinde kullanılan UV emici bileşik sentezi

Organic Synthesis Advanced (University) 75 dak ~$18,00

Hedef

Benzaldehit ile asetonun çapraz aldol kondenzasyonu ile dibenzalaseton sentezlemek ve karbon-karbon bağı oluşumunu göstermek.

Arka Plan

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.

Güvenlik Uyarıları

  • NaOH is corrosive
  • Benzaldehyde is an irritant with a strong almond odor
  • Acetone is flammable
  • Work in a fume hood

Gerekli KKD

goggles gloves lab_coat

Malzemeler

  • 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

Ekipman

250 mL Erlenmeyer flask Buchner funnel Filter flask Vacuum pump Melting point apparatus Ice bath Magnetic stirrer

Prosedür

1

Dissolve 5 mL benzaldehyde in 20 mL ethanol in the Erlenmeyer flask.

3 dak Fume hood — benzaldehyde is an irritant
2

Add 1.5 mL acetone to the flask and stir.

2 dak
3

Slowly add 25 mL of 10% NaOH while stirring. A yellow precipitate should begin forming.

5 dak NaOH is corrosive
4

Stir the mixture at room temperature for 30 minutes.

30 dak
5

Cool the flask in an ice bath for 10 minutes to maximize crystallization.

10 dak
6

Collect the yellow crystals by vacuum filtration. Wash with cold water.

10 dak
7

Dry the product and determine the melting point (pure dibenzalacetone: 110-112°C).

10 dak
8

Calculate the percent yield.

5 dak

Beklenen Sonuçlar

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.

Temizlik

Dispose of organic waste in designated containers. Neutralize NaOH waste. Rinse all glassware.

Ayrıntılar

Kategori
Organic Synthesis
Zorluk
Advanced (University)
Süre
75 dak
Tahmini Maliyet
$18,00
Adımlar
8
Malzemeler
5

Daha Fazla Deney

Asetaminofen (Parasetamol) Sentezi 80 min Aspirin (Asetilsalisilik Asit) Sentezi 90 min Bitkisel Yağdan Biyodizel Üretimi 60 min Çaydan Kafein Ekstraksiyonu 90 min Etil Asetatın Fischer Esterifikasyonu 90 min Luminol Sentezi 120 min Muz Aroması (İzoamil Asetat) Sentezi 90 min Naylon 6,10 Yapımı (Naylon İp Hilesi) 30 min Sabunlaşma ile Sabun Yapımı 60 min Sümüklü Oyun Hamuru Sentezi (Çapraz Bağlı PVA) 20 min

Frequently Asked Questions

What is the objective of Aldol Kondenzasyonu (Dibenzalaseton)?
Benzaldehit ile asetonun çapraz aldol kondenzasyonu ile dibenzalaseton sentezlemek ve karbon-karbon bağı oluşumunu göstermek.
How difficult is Aldol Kondenzasyonu (Dibenzalaseton)?
This experiment is rated as Advanced (University). It takes approximately 75 minutes to complete.
What safety precautions are needed for Aldol Kondenzasyonu (Dibenzalaseton)?
Key safety precautions include: NaOH is corrosive; Benzaldehyde is an irritant with a strong almond odor; Acetone is flammable.
What materials are needed for Aldol Kondenzasyonu (Dibenzalaseton)?
The main materials required are: Benzaldehyde, Acetone, Sodium hydroxide (NaOH), Ethanol, Distilled water.
What results should I expect from Aldol Kondenzasyonu (Dibenzalaseton)?
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.