chem262lexp4

chem262lexp4 - AtLee Watson Experiment IV: Grignard...

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AtLee Watson Experiment IV: Grignard Reaction: Preparation of 1,1-Diphenylethanol In the Grignard reaction of phenylmagnesium bromide with acetophenone, benzene was formed instead of the predicted product, 1,1-diphenylethanol. The Grignard reagent (Ph-MgBr) reacted completely with water molecules in the air. There was 1.72 cm of precipitation on the day in which the experiment was carried out, thus more water molecules in the atmosphere were available to react with the Grignard reagent. One possible cause for the exposure of the Grignard reagent for air was the small delay in applying the septum onto the 10-mL round-bottomed flask containing the acetophenone and diethyl ether and the test tube of phenylmagnesium bromide. More water molecules were trapped in the two containers and were available to react. If the reaction was carried out correctly and in optimal conditions (under an argon hood to eliminate water molecules in the air) the theoretical amount of 1,1-diphenylethanol would have been 0.555
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This note was uploaded on 09/16/2008 for the course CHEM 262L taught by Professor Mbadugua during the Spring '08 term at UNC.

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chem262lexp4 - AtLee Watson Experiment IV: Grignard...

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