25. Condensation Chemistry

Predict the products of self-condensation of the following esters.

(d)

Predict the major products of the following crossed Claisen condensations.

(c)

Draw the structure of the Claisen condensation product for each of the following compounds.

Draw the structure of the Claisen condensation product for each of the following compounds.

Give the structure of the ester precursor for the following Claisen condensation product.

Which of the following esters cannot undergo a Claisen condensation?

Indicate how each of the following compounds can be synthesized from the given starting material and any other necessary reagents:

b.

Draw the products of the following reactions:

a. diethyl heptanedioate: (1) sodium ethoxide; (2) HCl

Draw the products of the following reactions:

b.

Draw the products of the following reactions:

a.

Draw the products of the following reactions:

a.

There are other condensation reactions similar to the aldol and Claisen condensations:

b. What compound is formed if water is added to the product of a Perkin condensation?

Some (but not all) of the following keto esters can be formed by Dieckmann condensations. Determine which ones are possible, and draw the starting diesters.

(c)

(d)