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Which of the following esters cannot undergo a successful Claisen condensation? Which of the following esters cannot undergo a successful Claisen condensation? A) I B) I and II C) II and III D) IV E) I and IV


A) I
B) I and II
C) II and III
D) IV
E) I and IV

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In aqueous base, the chiral ketone shown here racemizes.Provide an explanation. In aqueous base, the chiral ketone shown here racemizes.Provide an explanation.

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Initially, a planar enolate is formed.Th...

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Which of the following is a mechanistic intermediate in this Mannich reaction? Which of the following is a mechanistic intermediate in this Mannich reaction? A) B) C) D) E)


A) Which of the following is a mechanistic intermediate in this Mannich reaction? A) B) C) D) E)
B) Which of the following is a mechanistic intermediate in this Mannich reaction? A) B) C) D) E)
C) Which of the following is a mechanistic intermediate in this Mannich reaction? A) B) C) D) E)
D) Which of the following is a mechanistic intermediate in this Mannich reaction? A) B) C) D) E)
E) Which of the following is a mechanistic intermediate in this Mannich reaction? A) B) C) D) E)

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Draw a mechanism for the following transformation.Include all necessary lone pairs of electrons, curved arrows, and nonzero formal charges. Draw a mechanism for the following transformation.Include all necessary lone pairs of electrons, curved arrows, and nonzero formal charges.

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What is the product of the following reaction? What is the product of the following reaction?

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Draw a mechanism for the following transformation.Include all necessary lone pairs of electrons, curved arrows, and nonzero formal charges. Draw a mechanism for the following transformation.Include all necessary lone pairs of electrons, curved arrows, and nonzero formal charges.

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Draw a mechanism for the transformation shown here.Include any necessary lone pairs of electrons, curved arrows, and nonzero formal charges. Draw a mechanism for the transformation shown here.Include any necessary lone pairs of electrons, curved arrows, and nonzero formal charges.

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Why should lithium diisopropylamide (LDA) be used in enolate alkylation reactions?


A) LDA completely converts one equivalent of carbonyl to enolate.
B) LDA is too bulky to act as a nucleophile.
C) Lithium complexation with the enolate oxygen can reduce O-alkylation.
D) LDA will selectively remove the least hindered protons from the carbonyl.
E) All these reasons are valid.

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Which of these structures is the product of the reaction? Which of these structures is the product of the reaction? A) B) C) D) E) None of these structures is the product of the reaction.


A) Which of these structures is the product of the reaction? A) B) C) D) E) None of these structures is the product of the reaction.
B) Which of these structures is the product of the reaction? A) B) C) D) E) None of these structures is the product of the reaction.
C) Which of these structures is the product of the reaction? A) B) C) D) E) None of these structures is the product of the reaction.
D) Which of these structures is the product of the reaction? A) B) C) D) E) None of these structures is the product of the reaction.
E) None of these structures is the product of the reaction.

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What is the product of this reaction? What is the product of this reaction? A) B) C) D) E)


A) What is the product of this reaction? A) B) C) D) E)
B) What is the product of this reaction? A) B) C) D) E)
C) What is the product of this reaction? A) B) C) D) E)
D) What is the product of this reaction? A) B) C) D) E)
E) What is the product of this reaction? A) B) C) D) E)

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Which of the following would be products of the following crossed aldol condensation reaction? Which of the following would be products of the following crossed aldol condensation reaction? A) B) C) D) E) All would be products


A) Which of the following would be products of the following crossed aldol condensation reaction? A) B) C) D) E) All would be products
B) Which of the following would be products of the following crossed aldol condensation reaction? A) B) C) D) E) All would be products
C) Which of the following would be products of the following crossed aldol condensation reaction? A) B) C) D) E) All would be products
D) Which of the following would be products of the following crossed aldol condensation reaction? A) B) C) D) E) All would be products
E) All would be products

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