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8. Give products or required starting materials for these crossed-Claisen condensations that use two different esters....
5. Ester enolates (as well as enolates from ketones) are often best generated using sterically hindered bases such as t-butoxide, since a bulky base will be less likely to act as a nucleophile and attack the carbonyl carbon. Give the enolates generated by the following bulky bases, then show the product of enolate alkylation. (Hint – the second step is an SN2 reaction.). The first one is done as an example. Be sure to count your carbons! Br + LIEN...