Question

Complete the mechanism for the reaction of butanone with NaBH4 followed by the addition of aqueous acid. Butanone is a 4 carbon chain where carbon 2 is double bonded to oxygen. This reacts with N a B H 4, followed by H 3 O plus to give the final product. Step 1: draw curved arrows. ⟶ Step 2: Draw the charged organic intermediate product. Include nonbonding electrons and charges. Omit the counterion. −→−−H3O+ Step 3: Draw the final product

Answer 1

The formation of a primary alcohol from a ketone involves the use of a ketone and NaBH4 followed by an acid workup.

Formation of a primary alcohol

The question is unclear but clearly relates to the formation of a primary alcohol. The first step in this reaction is the attack of the NaBH4 on the carbonyl carbon of butanone.

The reaction sequence is completed by an acid work up in which an acidic hydrogen is abstracted by the nucleophile to yield a primary alcohol.

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