1. DIBALH, -78°C а) OCH3 2. H,О CH3NHCH3, trace H* b) 1. excess LİAIH4 c) OCH3 2. НЗО+ d) CH3NH2, trace H*, NaBH3CN CH;CH2NH2, trace H* e) `H

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Chapter1: Chemical Foundations
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Give the major organic product of the following reactions (a-e).

### Reaction Schemes for Chemical Transformations

Below are various organic reactions depicting the transformation of different carbonyl compounds using specific reagents and conditions.

#### a) Ester Reduction

- **Substrate:** Methyl butanoate
- **Reagents and Conditions:**
  1. **DIBAL-H, -78°C**
  2. Water (H₂O)
- **Transformation:** The ester group is reduced, typically to an aldehyde, under these conditions.

#### b) Imine Formation

- **Substrate:** Cyclohexanone
- **Reagents:**
  - Dimethylamine (CH₃NHCH₃)
  - Trace acid (H⁺)
- **Transformation:** The ketone undergoes nucleophilic addition with the amine to form an imine.

#### c) Diester Reduction

- **Substrate:** Methyl acetoacetate (a β-keto ester)
- **Reagents and Conditions:**
  1. Excess Lithium Aluminium Hydride (LiAlH₄)
  2. Acidic workup (H₃O⁺)
- **Transformation:** The β-keto ester is completely reduced to the corresponding alcohols.

#### d) Reductive Amination

- **Substrate:** 2-Hexanone
- **Reagents:**
  - Methylamine (CH₃NH₂)
  - Trace acid (H⁺)
  - Sodium cyanoborohydride (NaBH₃CN)
- **Transformation:** The ketone is converted into an amine via reductive amination.

#### e) Imine Formation with Benzaldehyde

- **Substrate:** Benzaldehyde
- **Reagents:**
  - Ethylamine (CH₃CH₂NH₂)
  - Trace acid (H⁺)
- **Transformation:** Similar to example b, the aldehyde forms an imine with the primary amine under the presence of a trace acid.

These reactions demonstrate common transformations in organic synthesis, particularly involving carbonyl compounds and their reactions with metal hydrides, amines, and reducing agents.
Transcribed Image Text:### Reaction Schemes for Chemical Transformations Below are various organic reactions depicting the transformation of different carbonyl compounds using specific reagents and conditions. #### a) Ester Reduction - **Substrate:** Methyl butanoate - **Reagents and Conditions:** 1. **DIBAL-H, -78°C** 2. Water (H₂O) - **Transformation:** The ester group is reduced, typically to an aldehyde, under these conditions. #### b) Imine Formation - **Substrate:** Cyclohexanone - **Reagents:** - Dimethylamine (CH₃NHCH₃) - Trace acid (H⁺) - **Transformation:** The ketone undergoes nucleophilic addition with the amine to form an imine. #### c) Diester Reduction - **Substrate:** Methyl acetoacetate (a β-keto ester) - **Reagents and Conditions:** 1. Excess Lithium Aluminium Hydride (LiAlH₄) 2. Acidic workup (H₃O⁺) - **Transformation:** The β-keto ester is completely reduced to the corresponding alcohols. #### d) Reductive Amination - **Substrate:** 2-Hexanone - **Reagents:** - Methylamine (CH₃NH₂) - Trace acid (H⁺) - Sodium cyanoborohydride (NaBH₃CN) - **Transformation:** The ketone is converted into an amine via reductive amination. #### e) Imine Formation with Benzaldehyde - **Substrate:** Benzaldehyde - **Reagents:** - Ethylamine (CH₃CH₂NH₂) - Trace acid (H⁺) - **Transformation:** Similar to example b, the aldehyde forms an imine with the primary amine under the presence of a trace acid. These reactions demonstrate common transformations in organic synthesis, particularly involving carbonyl compounds and their reactions with metal hydrides, amines, and reducing agents.
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