Dicarbonyl Compounds by Acylation of Ketone Enolates

Write mechanisms that account for the products that are formed in the crossed Claisen condensation just illustrated of ethyl phenylacetate with diethyl carbonate. 

What products would you expect to obtain from each of the following crossed Claisen condensations  

As we learned earlier in this section, esters that have only one a hydrogen cannot be converted to j8-keto esters by sodium ethoxide. However, they can be converted to j8-keto esters by reactions that use very strong bases such as hthium diisopropylamide (EDA) (Section 18.4). The strong base converts the ester to its enolate ion in nearly quantitative yield. This allows us to acylate the enolate ion by treating it with an acyl chloride or an ester. An example of this technique using EDA is shown here  

Chapter 19 Condensation and Conjugate Addition Reactions of Carbonyl Compounds 

Keto esters are capable of undergoing cyclization reactions similar to the Dieckmann condensation. Write a mechanism for the following reaction. 

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