Question

57. Which type of precursor is used as reactant in intramolecular Claisen condensation?
A. One molecule with an ester end
B. Two molecules of ester
C. One molecule with two ester ends
D. One molecule of ester and enolate​

Answer 1

Answer:

Answer: c

Explanation: In intramolecular Claisen condensations, reactions occur for 1,6 and 1,7 diesters, as these substances result in the formation of compounds containing five and six membered rings, respectively.

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Answer 2

C. One molecule with two ester ends is used as a reactant in intramolecular Claisen condensation.

• The Claisen condensation is an organic reaction in which carbon-carbon bond formation occurs between two ester groups.
• When the two ester groups belong to two molecules, it is called intermolecular condensation.
• In the case of diesters, both the ester groups are present on a single molecule. Thus they can undergo an intramolecular reaction.
• The product formed through intramolecular Claisen condensation is a cyclic beta-keto ester.
• The intramolecular condensation is popularly known as the Dieckmann condensation.