Ans Sample Ex3 - 1 How could you perform the following crossed-Aldol reaction to obtain the product selectively A B C D 2 Use sodium methoxide Use

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1. How could you perform the following crossed-Aldol reaction to obtain the product selectively? A. Use sodium methoxide. B. Use potassium tert -butoxide. C. Use acetic acid. D. Use lithium diisopropylamide. 2. Why is the following product not formed in this Aldol reaction? A. A ketone enolate cannot add into a ketone. B. The cyclopropane ring is too strained to form. C. The two ketones are too far apart. D.NaOMe is not a strong enough base. 3. What is the product of the following reaction before any acid work-up of the reaction? 4. What reagents would you use to form the following ketoester? A. Acetone, diethyl carbonate, sodium ethoxide B. Acetone, diethyl carbonate, sodium methoxide C. Ethyl acetate, acetone, sodium ethoxide D. Ethyl acetate, ethyl bromide, LDA
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5. What will be the major product of the following reaction? 6. What will be the major product of the following reaction? 7. What is the product? (two answers acceptable)
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8. What is the product? (two answers acceptable) 9. What is the missing reagent in the reaction below? A. FeBr 3 B. Pyridine C. NaOH D. LDA 10. What was the starting material in the reaction below? A. 2,6-dimethylcyclohexanone B. 2,6-dimethylcyclohexane C. 2,6-dimethylcyclohex-2-enone D. Aniline 11. What is (are) the missing reagent(s) in the following reaction? A. NaOEt B. HOAc C. H 2 CO, NaOEt D. HCO 2 Et, NaOEt 12. In several reactions of carbonyl compounds that we have studied the reactions are reversible. Which reaction listed below is not reversible? A. Aldol condensation B. Claisen condensation C. Dieckman condensation D. Ester hydrolysis in acid E. Amide hydrolysis in base
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13. There are several variations of the Aldol reaction. Which of the following types of reactants leads to only one possible product with the Aldol condensation reaction? A. Two different aldehydes with α -hydrogens are able to form a single Aldol condensation product. B. Two different ketones with
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This note was uploaded on 06/11/2010 for the course CEM CEM252 taught by Professor ? during the Summer '10 term at Michigan State University.

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Ans Sample Ex3 - 1 How could you perform the following crossed-Aldol reaction to obtain the product selectively A B C D 2 Use sodium methoxide Use

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