NaBH4 Reductions of Benzil - Results and Discussion When 10...

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Results and Discussion When 10 mg of NaBH 4 was added to the benzil ethanol solution, the solution went from a yellow liquid to a translucent, cloudy white-ish liquid. In this experiment, 0.020 grams of hydrobenzoin was produced. The percent yield was calculated as follows: . × . × 0 05 g benzil 1 mol benzil210 22 g benzil 1 mol hydrobenzoin1 mol benzil × . = . 214 27 g hydrobenzoin 1 mol hydrobenzoin 0 05 g hydrobenzoin = . . × %= . % percent yield 0 020 grams product0 051 grams product 100 39 2 The percent yield indicates that much of the product was lost or that experimental error occurred. The observed melting point of this compound was 128.7-134.8 ºC. The theoretical melting point for the cis confirmation of hydrobenzoin is 137-139 ºC. It is necessary to use the meso melting point to correspond with the cis confirmation. The reason that the observed melting point was lower is because the entire product was in the cis confirmation. The theoretical melting point for racemic hydrobenzoin is 122-123 ºC. This implies that the observed melting point was lower
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This note was uploaded on 06/28/2011 for the course CH 237-238 taught by Professor Dr.jackienikles during the Spring '11 term at University of Alabama at Birmingham.

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NaBH4 Reductions of Benzil - Results and Discussion When 10...

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