Practical A copy

Practical A copy - 2 How did you remove the sodium hydroxide once the reaction was completed 3 How did you decide the reaction was complete 4 Can

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Organic Chemistry Laboratory - Second Semester Practical - A This experiment requires preparation of the chalcone, 3 from the base catalyzed reaction between piperonal (3,4-methylenedioxybenzaldehyde, 1 and acetophenone (acetylbenzene, 2 ). O O C H 2 H O O C H 3 O O C H 2 O 1 + 2 3 General procedure: Use about 150 mg of piperonal and allow it to react with one equivalent of acetophenone with stirring in 0.80 mLs of 95% ethanol. While stirring the reactiants at room temperature, add 0.10 mLs soldium hydroxide solution (prepared by your instructor from 0.60 g NaOH in 1 mL of water). Recrystallize the product from 95% ethanol. Report the yield and melting point. Questions and problems: 1. Why is aqueous sodium hydroxide added to the organic reactants?
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Unformatted text preview: 2. How did you remove the sodium hydroxide once the reaction was completed? 3. How did you decide the reaction was complete? 4. Can you offer a suggestion as to why the reaction of acetophenone with itself does not appear to any great extent? Does the same apply to the self-condensation of benzophenone? 5. How is the final product separated from the starting material? 6. What experiment(s) did you perform this semester that you would consider similar to this one? How are they similar (or different)? 7. What is the molal concentration of your sodium hydroxide solution? What is the mole fraction sodium hydroxide? What is the weight percent sodium hydroxide ?...
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This note was uploaded on 06/05/2009 for the course DONT Dont taught by Professor Dont during the Spring '09 term at Adelphi.

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