Abstract
The synthesis of racemic 3-(2-methoxyphenoxy)-1,2-propanediol (guaifenesin), an expectorant found in well-known cough syrups such as Benylin, is undertaken by a Williamson ether synthesis reaction. The same compound is simultaneously isolated and characterized from commercially available Guai-Aid cough tablets. The experiment is well-suited towards the introductory part of an advanced organic laboratory course and complements typical lecture topics in a stimulating manner. Consideration is given towards reaction mechanisms, stereochemistry, optical activity, pharmaceutical synthesis, and spectroscopic analysis. Discussion of the merits or disadvantages of marketing a drug as a racemic mixture, with reference to the notorious thalidomide case study, and the concept of enantioselective synthesis is possible.
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