labreport2 - TheSodiumBorohydrideReductionofBenzilandBenzoin

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The Sodium Borohydride Reduction of Benzil and Benzoin Purpose: The purpose of this experiment was to observe the reduction of benzil and benzoin to hydrobenzoin using sodium borohydride and to compare the products of both reductions. Procedure: The procedure involved taking 0.35 mmoles of benzil and benzoin in separate reaction tubes with 0.5 mL of 2-propanol. 15 mg of sodium borohydride was also added and left at room temperature for 15 minutes. Physical properties were noted throughout the experiment and progress was tracked by thin layer chromatography. The plates were developed in 60:40 hexane:ethyl acetate, and the system was spotted in even intervals of time. Water was added and the solution was heated, followed by another addition of hot water and an ice bath. The crystals are extracted, dried, weighed, and melting points are taken. Data and Results: The starting material, benzil, comes in the form of yellow crystals. Upon adding the sodium borohydride to the system, it began to turn brown in color and bubbles were
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This note was uploaded on 03/17/2009 for the course CHEM 3BL taught by Professor Chunmei during the Spring '08 term at University of California, Berkeley.

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labreport2 - TheSodiumBorohydrideReductionofBenzilandBenzoin

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