Draw the starting alkyne that would lead to this major product under these conditions. Drawing 1. BH3-THF 2. H2O2, NaOH

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Chapter1: Chemical Foundations
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**Draw the Starting Alkyne for the Major Product**

**Objective:**
Determine the starting alkyne that, under the given conditions, yields the major product shown.

**Conditions:**

1. **Reagents:**
   - **First Step:** \( \text{BH}_3 \text{-THF} \) (borane-tetrahydrofuran complex)
   - **Second Step:** \( \text{H}_2\text{O}_2, \text{NaOH} \) (hydrogen peroxide and sodium hydroxide)

2. **Process:**
   - The transformation involves hydroboration-oxidation, a two-step reaction widely used for converting alkenes or alkynes to alcohols or carbonyl groups.

**Observed Reaction Pathway:**

- **Product Formation:**
  - The shown product is an aliphatic compound with a carbonyl group (aldehyde) on the terminal carbon of a chain.
  - Notably, the five-membered ring remains intact, indicating no rearrangement occurred in the ring structure.

**Structural Analysis:**

- **Final Structure:**
  - A hexagonal ring connected to a longer carbon chain ending in an aldehyde group.

This exercise helps understand the preparation and transformation of hydrocarbons using specific reagents, emphasizing the synthesis of aldehydes via the hydroboration-oxidation reaction process.
Transcribed Image Text:**Draw the Starting Alkyne for the Major Product** **Objective:** Determine the starting alkyne that, under the given conditions, yields the major product shown. **Conditions:** 1. **Reagents:** - **First Step:** \( \text{BH}_3 \text{-THF} \) (borane-tetrahydrofuran complex) - **Second Step:** \( \text{H}_2\text{O}_2, \text{NaOH} \) (hydrogen peroxide and sodium hydroxide) 2. **Process:** - The transformation involves hydroboration-oxidation, a two-step reaction widely used for converting alkenes or alkynes to alcohols or carbonyl groups. **Observed Reaction Pathway:** - **Product Formation:** - The shown product is an aliphatic compound with a carbonyl group (aldehyde) on the terminal carbon of a chain. - Notably, the five-membered ring remains intact, indicating no rearrangement occurred in the ring structure. **Structural Analysis:** - **Final Structure:** - A hexagonal ring connected to a longer carbon chain ending in an aldehyde group. This exercise helps understand the preparation and transformation of hydrocarbons using specific reagents, emphasizing the synthesis of aldehydes via the hydroboration-oxidation reaction process.
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