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Results-Grignard - bromobenzene at one time The actual...

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Results: After completing Part A and B of our experiment (starting with .679 grams of benzophenone), we collected a pink-red crude product. After partially completing Part C, we noticed that we hardly had any crude product to recrystallize. Our lab instructor showed us ways to collect the small amount of crude product in order to recrystallize it and determine a weight and melting point. We placed our crude product in an ice bath for about 30 minutes, and also heated the mixture to form a product. Surprisingly, we were able to collect a product. We collected 0.012 grams of triphenylmethanol, which led to a 1.24 percent yield. The melting point of our product was 100-110ºC. Conclusion: Our very low percent yield could have been a result of adding too much
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Unformatted text preview: bromobenzene at one time. The actual melting point of triphenylmethanol is 163 ºC. Our product’s melting point is significantly lower than this melting point, which shows the presence of impurities. That could have been caused by adding too much bromobenzene at one time, not warming the solution adequately, etc. Although we only were able to produce a small amount of crude product, we efficiently recrystallized it and determined the melting point and percent yield (even though our product was obviously impure). Questions: Write a balanced equation for the reaction of phenylmagnesium bromide with water. Provide a synthesis of triphenylmethanol that uses a Grignard reaction and does not start with benzophenone....
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