Summary of CHEM 3021 Experiment 7 - Diels-Alder Reaction
Experimental Methodology:
- Materials Required:
- 25 mL conical flask
- Stir bar
- Maleic anhydride (pre-weighed)
- 8 mL of xylenes (solvent)
- Procedure:
- Combine Maleic anhydride and xylenes in the conical flask.
- Set up the apparatus for reflux with a reflux condenser (water in at the bottom, water out at the top).
- Reflux the mixture for 30 minutes.
- After reflux, cool the reaction mixture to room temperature, then transfer it to an ice bath.
- Rinse the precipitated crystals with cold hexanes.
- Perform suction filtration to collect the solid product.
- Dry the solid and prepare for recrystallization.
- Heat xylenes and add the solid to dissolve.
- Allow the solution to cool to room temperature, then transfer to an ice bath for a second filtration.
- Rinse again with cold hexanes and perform a final suction filtration.
- Final Steps:
- The final product is dried under vacuum.
- Mass, melting point, and spectra data will be provided for analysis.
Scientific Concepts:
- Diels-Alder Reaction: A cycloaddition reaction between a conjugated diene and a dienophile, forming a six-membered ring.
- Reflux: A technique used to heat a reaction mixture while preventing the loss of solvent.
- Crystallization: A method for purifying solid compounds by dissolving them in a solvent and allowing them to reform into pure crystals.
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