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Chapter 24: Q.7. (page 962)

Question: Draw the products formed in each crossed aldol reaction.

a.

b.

Short Answer

Expert verified

Answer

a.

b.

Step by step solution

01

Cross aldol reaction

The reaction between two non-identical carbon compounds in the presence of a base is termed crossed aldol reaction.

It is also known as a mixed aldol reaction.

02

Cross aldol reaction of a

The aldol reaction between butanal and formaldehyde is represented below:

Cross aldol reaction of a.

03

Cross aldol reaction of b

The aldol reaction between benzaldehyde and cyclohexanone is represented below:

Cross aldol reaction b.

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Most popular questions from this chapter

Question: Avobenzone is a conjugated compound that absorbs ultraviolet light with wavelengths in the 320鈥�400 nm region, so it is a common ingredient in commercial sunscreens. Write out two different crossed Claisen reactions that form avobenzone.

Question: Which carbonyl compounds do not undergo an aldol reaction when treated with OH- in H2O ?
  1. Question:尾 -Vetivone is isolated from vetiver, a perennial grass that yields a variety of compounds usedin traditional eastern medicine, pest control, and fragrance. In one synthesis, ketone A is converted to 尾-vetivone by a two-step process: Michael reaction, followed by intramolecular 00a00000ldol reaction.000 (a) What Michael acceptor is needed for the conjugate addition? (See Problem23.61 for another method to form the bicyclic ring system of 尾-vetivone.) (b) Draw a stepwise mechanism for the aldol reaction, which forms the six-membered ring.

Question: Which of the following compounds can serve as Michael acceptors?

Question: A key step in the synthesis of donepezil (trade name Aricept) is a directed aldol reaction that forms 伪,尾-unsaturated carbonyl compound X. What carbonyl starting materials are needed to prepare X using a directed aldol reaction? What reagents are needed to convert X to donepezil?
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