What are products of the following reactions?
d.

Guida verificata passo dopo passo

Step 1: Identify the reaction type. This is a hydroboration-oxidation reaction of an alkyne. The reagents R₂BH/THF followed by HO⁻, H₂O₂, and H₂O indicate that the alkyne will undergo anti-Markovnikov addition to form an aldehyde or ketone.

Step 2: Analyze the structure of the starting alkyne. The molecule contains a terminal alkyne (triple bond at the end of the chain) with a methyl group attached to the second carbon.

Step 3: In the first step, R₂BH adds to the terminal alkyne in an anti-Markovnikov fashion. The boron atom attaches to the less substituted carbon of the triple bond, forming an organoborane intermediate.

Step 4: In the second step, the organoborane intermediate reacts with hydrogen peroxide (H₂O₂) in the presence of hydroxide ions (HO⁻). This oxidation step converts the boron group into a hydroxyl group (-OH), resulting in the formation of an aldehyde.

Step 5: The final product is an aldehyde with the hydroxyl group replacing the terminal alkyne. The structure of the product will be CH₃-CH₂-CHO (propanal).

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