25. Condensation Chemistry

Give the structure of the aldehydes or ketones used to create the product prepared by a crossed aldol condensation reaction.

Give the structure of the aldehydes or ketones used to create the product prepared by a crossed aldol reaction.

What product can be isolated from the following aldol condensation reaction?

Predict the products of the following reactions.

(d)

Predict the major products of the following base-catalyzed aldol condensations with dehydration.

(b) 2,2-dimethylpropanal + acetophenone

Predict the major products of the following base-catalyzed aldol condensations with dehydration.

(a) benzophenone (PhCOPh) + propionaldehyde

Propose mechanisms for the following base-catalyzed condensations, with dehydration.

(b) benzaldehyde with propionaldehyde

Propose mechanisms for the following base-catalyzed condensations, with dehydration.

(a) 2,2-dimethylpropanal with acetaldehyde

Propose a mechanism for the following reaction.

Predict the products of the following aldol condensations. Show the products both before and after dehydration.

(c)

Predict the products of the following aldol condensations. Show the products both before and after dehydration.

(e)

Predict the products of the following aldol condensations. Show the products both before and after dehydration.

(d)

Show how crossed Claisen condensations could be used to prepare the following esters.

(c)

(d)