25. Condensation Chemistry

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

(e)

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

(a) 2,2-dimethylpropanal with acetaldehyde

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

(d)

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

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

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

(b) 2,2-dimethylpropanal + acetophenone

Predict the products of the following reactions.

(d)

Propose a mechanism for the following 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?

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

(c)

(d)

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

(c)