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Key Concepts

Acetylide Ion Formation and Nucleophilic Substitution

This concept involves the deprotonation of a terminal alkyne to generate an acetylide ion, which is a strong nucleophile. The acetylide ion can then attack various electrophilic alkyl halides to form carbon–carbon bonds, thereby extending the carbon chain. In synthesis planning, this strategy is crucial for constructing larger molecules from smaller units such as ethyne.

Stereoselective Partial Hydrogenation of Alkynes

Partial hydrogenation of alkynes to alkenes is a method where specific catalysts are used to control the stereochemistry of the resulting double bond. For instance, using a poisoned catalyst like Lindlar’s catalyst leads to cis-alkenes, while alternative conditions can produce trans-alkenes. This control over stereochemistry is essential in synthesizing molecules with defined geometric configurations.

Dissolving Metal Reduction

Dissolving metal reduction is a reaction that uses metals in liquid ammonia to reduce alkynes to trans-alkenes. This method proceeds via a radical anion intermediate, often leading to high selectivity for E-alkenes. It is a valuable technique when the synthesis requires the formation of trans double bonds, complementing other partial hydrogenation methods that favor cis-alkenes.

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