The reaction of two equivalents of Mg with 1,4 -dibromobutane produces compound A. The reaction

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The reaction of two equivalents of Mg with 1,4...

The reaction of two equivalents of $\mathrm{Mg}$ with 1,4 -dibromobutane produces compound $\mathrm{A}$. The reaction of A with two equivalents of $\mathrm{CH}_{3} \mathrm{CHO}$ (acetaldehyde), followed by work-up with dilute aqueous acid, produces compound $\mathrm{B}$, having the formula $\mathrm{C}_{8} \mathrm{H}_{18} \mathrm{O}_{2}$. What are the structures of $\mathrm{A}$ and $\mathrm{B}$ ?

Key Concepts

Acidic Workup and Protonation of Alkoxides

Following nucleophilic addition reactions, the alkoxide intermediates formed are typically unstable and require treatment with dilute acid or water. This acidic workup protonates the alkoxides, yielding the stable alcohol products. This step is crucial to complete the transformation of reactive intermediates into functional organic compounds.

Nucleophilic Addition to Carbonyls

A central mechanism in organic chemistry where a nucleophile, such as a Grignard reagent, attacks the electrophilic carbon of a carbonyl group found in aldehydes, ketones, or other carbonyl compounds. The reaction results in the formation of an alkoxide intermediate which, upon subsequent protonation, becomes an alcohol.

Carbon–Carbon Bond Formation

Grignard reagents are key to forming new carbon–carbon bonds. They do so by attacking electrophilic carbon atoms, particularly those in carbonyl groups, to extend carbon chains. This strategy is fundamental in organic synthesis for constructing complex molecules from simpler ones.

Grignard Reagent Formation

This concept involves the preparation of organomagnesium halides by the reaction of an alkyl halide with magnesium metal in an aprotic solvent such as diethyl ether. In the reaction provided, a dihalide is converted into a bis(Grignard reagent), which is capable of acting as a strong nucleophile toward electrophilic centers.

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