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Unformatted text preview: Practice Exam 6 (10/6/10)
I. Predict the major product(s) for the following reactions and show the stereochemistry if any. Br CH3COO room temperature Me Cl MeOH 25 °C (R)-2-chlorobutane NaN3 25 °C II. In elimination reactions, t-butyl chloride reacts faster than isobutyl chloride. The difference in reactivities is accounted for by the stabilities of the incipient carbocations. Between the carbocation formed from t-butyl chloride is and the one from isobutyl chloride, which one more stable? Explain why. KOtBu Cl KOtBu Cl III. Draw the major product with appropriate stereochemistry. In addition, circle the correct stereochemistry, R or S, of each substrate and product. Br CN
R or S R or S IV. Circle which reaction would take place faster. Then explain why the reaction of your choice would be faster. Use drawings and narratives (concise), as appropriate. IVa. Circle one reaction. I I Br I Cl I Explain here. IVb. Circle one reaction.
Br OMe Br MeOH OMe MeOH Explain here. V. In the following reactions, which one reacts faster? Rationalize this observation. F EtOH F Br I EtOH I F DMF F Br I DMF I VI. Draw the major product for each reaction, including stereochemistry if any. NaH, DMF OH Br F I 1 equivalent of Cl DMSO ...
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- Chemical reaction, Carbocation, Br OMe Br