The numbering of the molecule begins across the double bond and goes in the direction where the lowest numbers for substituents can be achieved. Thus, the methyl group will be on carbon two and the bromine on carbon 3. Substituents are ordered alphabetically. The base molecule is a six-membered ring with one double bond. This is called a cyclohexene.

The hydrogen bonded to the alpha carbon on carbonyl compounds is weakly acidic and when reacted with a strong base can deprotonate forming and enolate ion which has two resonance structures as shown below:

In the reaction below, a ketone is protonated by a strong acid. This triggers the deprotonation of the weakly acidic hydrogen bonded to the alpha carbon by a bromide ion and formation of an alkene functional group.

Claisen condensation is a reaction between two molecules containing an ester functional group. Similar to ketones and aldehydes, esters are weakly acidic because the alpha hydrogen to the carbonyl group can be deprotonated in the presence of a base. The ion that is formed nucleophilicly bonds to a second ester molecule. As seen below, an ethoxide molecule expels. Addition of an acid in the final step gives the final product.

Claisen condensation is a reaction between two molecules containing an ester functional group. Similar to ketones and aldehydes, esters are weakly acidic because the alpha hydrogen to the carbonyl group can be deprotonated in the presence of a base. The ion that is formed nucleophilicly bonds to a second ester molecule. As seen below, an ethoxide molecule expels. Addition of an acid in the final step gives the final product.

The reaction given involves the direct alkylation of a nitrile containing compound by the production of an enolate ion. The alpha hydrogen to the nitrile group which is weakly acidic can be deprotonated in the presence of a base. LDA is a mild base that converts these compounds to the enolate ion. On the last step, through nucleophilic substitution by reaction with an alkyl halide with the enolate ion yields an alkyl group in the alpha position. LDA is sterically hindered therefore allowing for the production of an enolate ion without nucleophlic addition. Similarly, an ester or ketone containing compound can also undergo this type of reaction.

The reaction given involves the direct alkylation of a ketone containing compound by the production of an enolate ion. The alpha hydrogen to the ketone group which is weakly acidic can be deprotonated in the presence of a base. LDA is a mild base that converts these compounds to the enolate ion. On the last step, through nucleophilic substitution by reaction with an alkyl halide with the enolate ion yields an alkyl group in the alpha position. LDA is sterically hindered therefore allowing for the production of an enolate ion without nucleophlic addition. Similarly, an ester or nitrile containing compound can also undergo this type of reaction.

Claisen condensation is a reaction between two molecules containing an ester functional group. Similar to ketones and aldehydes, esters are weakly acidic because the alpha hydrogen to the carbonyl group can be deprotonated in the presence of a base. The ion that is formed nucleophilicly bonds to a second ester molecule. As seen below, an ethoxide molecule expels. Addition of an acid in the final step gives the final product.

Claisen condensation is a reaction between two molecules containing an ester functional group. Similar to ketones and aldehydes, esters are weakly acidic because the alpha hydrogen to the carbonyl group can be deprotonated in the presence of a base. The ion that is formed nucleophilicly bonds to a second ester molecule. As seen below, an ethoxide molecule expels. Additon of an acid in the final step gives the final product.