Arizona State University - CHM 238CHM238 Grignard Reaction Lab Report Final Synthesis of Triphenylmethanol Using a Grignard Reaction

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Synthesis of Triphenylmethanol Using a Grignard Reaction Elizabeth Miller Erickson Partner: Malik Alnaim Dr. Ian Pahk CHM238: T/11:40 am Abstract: In this experiment, triphenylmethanol was formed... through a multi-step synthesis reaction with the Grignard reagent, phenylmagnesium bromide. The synthesis was performed by first preparing the Grignard reagent using magnesium and bromobenzene, and then reacting the reagent with benzophenone. The final step included hydrolysis of the adduct using hydrochloric acid and extraction of the final product. The product was characterized through an IR spectrum to identify the presence of necessary bond frequencies for the expected functional groups, and a melting point was taken with a range from 160.9°C to 162.6°C. Triphenylmethanol was synthesized with 22% yield.Introduction: Organic reactions involving the formation of bonds between carbon atoms can be performed using Grignard reagents. These reagents are strong nucleophiles useful for forming bonds between the carbon double bonded to oxygen in carbonyl compounds, which are then protonated to form alcohols. In this experiment, the Grignard reagent, phenylmagnesium bromide, is used to synthesize triphenylmethanol from benzophenone. The synthesis was performed in two separate portions: the first consisting of the preparation of the Grignard reagent and the reaction with benzophenone, followed by the hydrolysis of the product to form the alcohol and the extraction of this product. [Show More]

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