Question

Predict the products of the following reactions:(d)

Accepted Answer

Step 1: Analyze the given reactants and reagents. The starting compound is butan-2-one, a ketone. The first set of reagents, KCN and HCN, indicates a cyanohydrin formation reaction. The second reagent, LiAlH4, is a strong reducing agent used to reduce functional groups such as nitriles to primary amines. Step 2: Understand the mechanism of cyanohydrin formation. In the presence of KCN and HCN, the ketone undergoes nucleophilic addition. The cyanide ion (CN⁻) attacks the carbonyl carbon of butan-2-one, forming a tetrahedral intermediate. Protonation by HCN leads to the formation of a cyanohydrin, which contains both a hydroxyl (-OH) group and a nitrile (-CN) group. Step 3: Predict the structure of the cyanohydrin product. The carbonyl group of butan-2-one is converted into a hydroxyl group, and a nitrile group is added to the same carbon. The resulting compound is 2-hydroxy-2-methylbutanenitrile. Step 4: Understand the reduction step with LiAlH4. LiAlH4 reduces the nitrile group (-CN) in the cyanohydrin to a primary amine (-CH₂NH₂). The hydroxyl group (-OH) remains unchanged during this reduction. Step 5: Predict the final product. After the reduction step, the final product is 2-hydroxy-2-methylbutanamine, which contains both a hydroxyl group and a primary amine group on the same carbon.

Predict the products of the following reactions:
(d)

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Concetti chiave

Nucleophilic Addition

Reduction Reactions

Functional Group Transformation