Benzophenone Lab Report

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Tangsiyuan Hua Mohammad Hasani Thursday-11:30-2:2 Synthesis of Triphenylmethanol from Benzophenone and Bromobenzene Abstract: The purpose of this experiment was to synthesize Triphenylmethanol by first producing the grignard reagent phenylmagnesium bromide. Then use the produced grignard reagent to synthesize triphenylmethanol, by reacting with benzophenone and then was protonated by H3O+. Recrystallization was used to purify the triphenylmethanol. The melting point was 161.7oC~162.5oc And IR had peaks at 3500cm-1 and 3000cm-1 the percent yield was %, the product had a high purity but a low % yield. Introduction: The purpose of this experiment is to form Triphenylmethanol by first producing the grignard reagent phenylmagnesium bromide. The carbanion is generated by electron transferred from magnesium. The carbanion then attacks the electrophilic carbonyl to give an anionic intermediate. This unstable intermediate rapidly eliminates to a methoxide anion . The resulting ketone is attacked again. The formed anion waits until next…show more content…
Draw benzophenone solution into the syringe as soon as the Grignard reagent is cooled to room temperature. This solution should be added as rapidly as possible to the stirred Grignard reagent, but at such a rate that the solution does not reflux too rapidly. Add the remaining bezophenone solution with the syringe. Allow the mixture to cool to room temperature as the addition is complete. The solution should turn to a red color and then gradually solidifies as the adduct is formed. When magnetic stirring is no longer effective,remove the syringe and then stir the mixture with a spatula. Remove the reaction flask from the apparatus and cap it. Occasionally, stir the contents of the flask. The adduct should be fully formed after about 15

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