Predict the products you would expect from the reaction of LiAlH₄ followed by hydrolysis 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 functional group in the given compound. The compound CH3-(CH2)8-CHO contains an aldehyde functional group (-CHO) at the end of the carbon chain.

Step 2: Understand the role of LiAlH4 (Lithium Aluminum Hydride). LiAlH4 is a strong reducing agent that reduces aldehydes to primary alcohols by adding hydrogen atoms to the carbonyl group.

Step 3: Write the reduction reaction. The aldehyde group (-CHO) will be reduced to a primary alcohol (-CH2OH). The carbon chain remains unchanged during this process.

Step 4: Consider the hydrolysis step. After the reduction by LiAlH4, hydrolysis (usually with water or a weak acid) is performed to quench the reaction and ensure the formation of the alcohol product.

Step 5: Combine the steps to predict the product. The final product will be CH3-(CH2)8-CH2OH, which is a primary alcohol with the same carbon chain length as the starting aldehyde.

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주요 개념

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Lithium Aluminum Hydride (LiAlH4) as a Reducing Agent

LiAlH4 is a powerful reducing agent commonly used in organic chemistry to reduce carbonyl compounds, such as aldehydes and ketones, to their corresponding alcohols. It donates hydride ions (H-) to the carbonyl carbon, resulting in the formation of an alcohol after the reaction. Understanding its reactivity is crucial for predicting the products of reactions involving carbonyl compounds.

Hydrolysis of Alkoxides

After the reduction of an aldehyde by LiAlH4, the resulting alkoxide intermediate can be hydrolyzed by adding water or an alcohol, such as methanol. This hydrolysis step converts the alkoxide into an alcohol, releasing the corresponding alkoxide ion. Recognizing this step is essential for determining the final product of the reaction sequence.

Aldehyde Structure and Reactivity

Aldehydes, characterized by the functional group -CHO, are highly reactive due to the presence of a carbonyl group. In the given compound, CH3-(CH2)8-CHO, the long carbon chain influences the physical properties but does not hinder the reactivity of the carbonyl group. Understanding the structure and reactivity of aldehydes is vital for predicting the outcome of their reactions with reducing agents.

Predict the products you would expect from the reaction of LiAlH4 followed by hydrolysis with the following compounds. You may assume that these reactions take place in methanol as the solvent.(a) CH3–(CH2)8–CHO