Exam 1 practice (1)

8 points provide a complete arrowpushing mechanism for

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Unformatted text preview: O O oC NaOH, 60 H + H2O 2. (8 points) Provide a complete, arrow ­pushing mechanism for the following transformation. Be sure to account for the observed relative stereochemistry in your mechanism. OO OH OH acetone, H2O; Then HCl, H2O H H O H O H O H OH OH H O H O H H Note: epoxide opening doesn’t happen until the second step (HCl, H2O). 2 3. (8 points) In the “Purification of Biphenyl” lab, you purified biphenyl from a colored impurity by two different methods; recrystallization and column chromatography. After each purification procedure, you analyzed your purified biphenyl by TLC analysis and by melting point analysis. a. How did TLC analysis help you determine the purity of your biphenyl? Be specific. The number of spots observed on a TLC plate indicates purity (one spot  pure compound). Comparison of the Rf to a known compound indicates identity of the compound (not necessarily purity)....
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