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Exam 24: Carbonyl Condensation Reactions

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Question 21

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What are the names for the two parts of the mechanism in a Robinson annulation?

A) Michael addition and intramolecular Claisen reaction
B) Michael addition and intramolecular aldol reaction
C) Claisen reaction and intramolecular aldol reaction
D) Aldol reaction and intramolecular Claisen reaction

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Question 22

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The -hydroxy carbonyl product of an Aldol reaction is oftentimes not the final isolated product, what is the explanation for this result?

A) It undergoes elimination, since water is a good leaving group.
B) The hydroxy group is oxidized to a carbonyl.
C) The hydroxy group reacts with the carbonyl to form a ketal.
D) Hydroxide is eliminated via an enolate intermediate.

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Question 23

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Which of the following carbonyl compounds do not undergo Aldol addition reactions when treated with aqueous sodium hydroxide?

What aldehyde or ketone is needed to prepare the following compound by an Aldol reaction?

What is the general name for the reaction product formed in a Claisen reaction?

What is the Aldol addition product formed from the reaction of acetone, (CH₃) ₂CO, with itself?

Which is the unsaturated carbonyl compound formed in the dehydration of the following -hydroxy carbonyl compound?

In the correct order, what are the three steps in the mechanism of an Aldol reaction?

What is the cyclic product formed in the intramolecular Aldol condensation when the following compound is treated with aqueous NaOH?

What is the name given to the Claisen reaction between two different esters?

Of the carbonyl compounds; (1) benzaldehyde, (2) acetophenone and (3) dicyclohexyl ketone, which compound has no -hydrogens?

What is the product of the self-condensation of ethanal (acetaldehyde) , shown below?

What type of esters can undergo Claisen reactions?

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?

What is an intramolecular Claisen reaction called?

What is the product of the following Claisen reaction?

What cyclic product is formed in the intramolecular Aldol condensation when the following compound is treated with aqueous NaOH?

What is the general name for the class of products formed in an Aldol condensation reaction?

Which of the following compounds can undergo an Aldol with itself?

What reaction type is a Claisen reaction?