Chapter 23: Q3P (page 759)
What enone product would you expect from aldol condensation of each of the following compounds?

Short Answer
ENONEcontains unsaturated carbonyl compound having alkene which is conjugated to ketone in the same compound.
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Chapter 23: Q3P (page 759)
What enone product would you expect from aldol condensation of each of the following compounds?

ENONEcontains unsaturated carbonyl compound having alkene which is conjugated to ketone in the same compound.
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The compound known as Hagemann’s ester is prepared by treatment of a mixture of formaldehyde and ethyl acetoacetate with base, followed by acid-catalyzed decarboxylation.

(a)The first step is an aldol-like condensation between ethyl acetoacetate and formaldehyde to yield an α,β-unsaturated product. Write the reaction, and show the structure of the product.
(b)The second step is a Michael reaction between ethyl acetoacetate and the unsaturated product of the first step. Show the structure of the product.
What condensation products would you expect to obtain by treatment of the following substances with sodium ethoxide in ethanol?
(a)Ethyl butanoate
(b)Cycloheptanone
(c)3,7-Nonanedione
(d)3-Phenylpropanal
What product would you expect to obtain from aldol cyclization of hexanedial,
The following reaction involves a conjugate addition reaction followed by an intramolecular Claisen condensation. Write both steps, and show their mechanisms.

The following reaction involves an intramolecular aldol reaction followed by a retroaldol-like reaction. Write both steps, and show their mechanisms.

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