Predict the products you would expect from the reaction of NaBH₄ with the following compounds. You may assume that these reactions take place in methanol as the solvent.
(a) CH₃–(CH₂)₈–CHO

검증된 단계별 안내

Step 1: Recognize the type of reaction. Sodium borohydride (NaBH4) is a reducing agent commonly used to reduce aldehydes and ketones to their corresponding alcohols. Methanol serves as the solvent in this reaction.

Step 2: Identify the functional group in the given compound. The compound CH3-(CH2)8-CHO contains an aldehyde group (-CHO) at the end of the carbon chain.

Step 3: Understand the mechanism of the reduction. NaBH4 donates a hydride ion (H⁻) to the carbonyl carbon of the aldehyde group. This breaks the double bond between the carbon and oxygen, forming an alkoxide intermediate.

Step 4: Protonation of the alkoxide intermediate. The alkoxide ion formed in the previous step is protonated by methanol (the solvent), resulting in the formation of a primary alcohol.

Step 5: Predict the product. The aldehyde group (-CHO) in CH3-(CH2)8-CHO is reduced to a primary alcohol (-CH2OH), yielding CH3-(CH2)8-CH2OH as the final product.

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주요 개념

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Reduction Reactions

Reduction reactions involve the gain of electrons or the decrease in oxidation state by a molecule. In organic chemistry, this often refers to the conversion of carbonyl groups (like aldehydes and ketones) into alcohols. Sodium borohydride (NaBH4) is a common reducing agent that effectively reduces aldehydes to primary alcohols.

Sodium Borohydride (NaBH4)

Sodium borohydride is a mild reducing agent used primarily for the reduction of aldehydes and ketones to their corresponding alcohols. It is less reactive than lithium aluminum hydride, making it suitable for selective reductions in various solvents, including methanol. Its ability to donate hydride ions (H-) is crucial for the reduction process.

Aldehyde Structure and Reactivity

Aldehydes are characterized by the presence of a carbonyl group (C=O) bonded to at least one hydrogen atom. This structure makes them more reactive than ketones, as they can be easily reduced to alcohols. In the given compound, CH3-(CH2)8-CHO, the aldehyde group is at the terminal position, making it a primary aldehyde that will yield a primary alcohol upon reduction.

Predict the products you would expect from the reaction of NaBH4 with the following compounds. You may assume that these reactions take place in methanol as the solvent.(a) CH3–(CH2)8–CHO