Draw the products formed when CH3 COCH2 CH2 CH=CH2 is treated with each reagent: (a) LiAlH 4, th

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Draw the products formed when CH3 COCH2 CH2 CH=CH2 is...

Draw the products formed when $\mathrm{CH}_{3} \mathrm{COCH}_{2} \mathrm{CH}_{2} \mathrm{CH}=\mathrm{CH}_{2}$ is treated with each reagent: (a) LiAlH $_{4},$ then $\mathrm{H}_{2} \mathrm{O} ;$ (b) $\mathrm{NaBH}_{4}$ in $\mathrm{CH}_{3} \mathrm{OH} ;$ (c) $\mathrm{H}_{2}$ ( 1 equiv), $\mathrm{Pd}-\mathrm{C} ;$ (d) $\mathrm{H}_{2}$ (excess), Pd-C; (e) $\mathrm{NaBH}_{4}(\mathrm{excess})$ in $\mathrm{CH}_{3} \mathrm{OH} ;$ (f) $\mathrm{NaBD}_{4}$ in $\mathrm{CH}_{3} \mathrm{OH}$

Key Concepts

Hydride Reduction of Carbonyl Compounds

This concept involves the nucleophilic addition of a hydride ion to a carbonyl carbon, resulting in the formation of an alkoxide intermediate that is later protonated to yield an alcohol. It highlights how reagents like LiAlH4 and NaBH4 selectively reduce carbonyl groups, with LiAlH4 being more reactive and capable of reducing a wider range of carbonyl functionalities under suitable conditions.

Reactivity and Selectivity of Hydride Reagents

Understanding the differences between reducing agents such as LiAlH4 and NaBH4 is critical. LiAlH4 is a stronger, less selective reductant that can reduce many functional groups, whereas NaBH4 is milder and typically reduces only the more electrophilic carbonyl groups. This reactivity profile is important when molecules contain multiple functional groups, as it allows for chemoselective transformations.

Catalytic Hydrogenation of Carbon–Carbon Double Bonds

Catalytic hydrogenation uses molecular hydrogen (H2) in the presence of a metal catalyst such as palladium on carbon (Pd/C) to add hydrogen across carbon–carbon double bonds. This process is generally selective for alkenes over carbonyl groups, particularly when the double bond is isolated from electron?withdrawing groups, and can be controlled by the stoichiometry of H2 employed.

Chemoselectivity in Multifunctional Organic Substrates

Chemoselectivity refers to the preferential reaction of one functional group in the presence of others. In substrates that have both carbonyl and alkene groups, the choice of reagent and conditions (e.g., using hydride donors versus catalytic hydrogenation) can allow selective reduction of one functional group while leaving the other intact.

Isotopic Labeling Using Deuteride Sources

Isotopic labeling with deuterium, such as employing NaBD4 instead of NaBH4, is used to track the incorporation of deuterium into molecules. This approach helps elucidate reaction mechanisms by following the fate of the deuteride ion, providing clear evidence of the specific site of hydride (or deuteride) addition to a carbonyl group.

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