What reagents would you use for the following syntheses? a....

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Key Concepts

Full Catalytic Hydrogenation

This method uses catalysts like palladium on carbon (Pd/C) along with hydrogen gas to fully reduce alkynes to alkanes. Unlike selective partial hydrogenation, this approach does not stop at the alkene stage, leading to complete saturation and yielding a molecule like hexane from 3-hexyne.

Selective Partial Hydrogenation using Lindlar's Catalyst

This concept involves using a specially poisoned catalyst (Lindlar's catalyst) to hydrogenate alkynes selectively to cis (Z) alkenes. The catalyst moderates the addition of hydrogen so that the reaction stops at the alkene stage without further reduction to an alkane, which is essential for synthesizing (Z)-3-hexene from 3-hexyne.

Dissolving Metal Reduction for trans Alkene Formation

This technique employs dissolved alkali metals (such as sodium) in a liquid ammonia medium to achieve the trans (E) configuration of alkenes. The mechanism involves a one-electron reduction process that adds hydrogen across the alkyne in a trans fashion, making it ideal for synthesizing (E)-3-hexene from 3-hexyne.

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