Exp 19 - Joseph Marcus Experiment 19: Synthesis of Aspirin...

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Joseph Marcus Experiment 19: Synthesis of Aspirin and Oil of Wintergreen August 16, 2009 In this experiment, two organic molecules are synthesized: oil of wintergreen and aspirin. A crude sample of aspirin is synthesized and later purified. Its purity is tested through several analytical techniques. The salicylic acid reacts with acetic anhydride to make aspirin. + Eqtn. 1 Salicylic acid + Acetic anhydride Acetylsalicylic Acid + Acetic Acid This experiment uses two different reactions involving salicylic acid. The salicylic acid has 2 functional groups: an alcohol group and a carboxylic acid group. In the first part of the experiment, aspirin is synthesized by reacting by reacting the acetic acid with the alcohol group of the salicylic acid. Instead of using acetic acid in the experiment, acetic anhydride was used in its place to react with the alcohol group and force the reaction to completion. This reaction forms aspirin (acetylsalicylic acid) and acetic acid. In the other reaction, methanol (an alcohol) reacts with the carboxylic acid group of salicylic acid to
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This note was uploaded on 12/02/2009 for the course CHEM chem1C taught by Professor O'dea during the Spring '09 term at UCSB.

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Exp 19 - Joseph Marcus Experiment 19: Synthesis of Aspirin...

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