.CI 1) AICI, 2) H,0 1) PPh, 2) BuLi Br 3) OH excess PCC HO.

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### Organic Chemistry Reaction Pathways

#### Reaction 1:

- **Starting Material:** A benzene ring attached to a propyl chloride group.
- **Reagents:**
  1. Aluminum chloride (AlCl₃)
  2. Water (H₂O)

This reaction represents a Friedel-Crafts alkylation where the aluminum chloride acts as a catalyst to facilitate the formation of a carbocation, leading to the alkylation of the benzene ring.

#### Reaction 2:

- **Starting Material:** Cyclohexyl bromide.
- **Reagents:**
  1. Triphenylphosphine (PPh₃)
  2. Butyllithium (BuLi)
  3. Cyclopentanone

This sequence suggests a Wittig reaction pathway. The phosphonium salt formation with PPh₃ and BuLi allows for the generation of an ylide, which then reacts with the cyclopentanone to form an alkene.

#### Reaction 3:

- **Starting Material:** 1,2-cyclohexanediol
- **Reagents:**
  - Excess pyridinium chlorochromate (PCC)

This reaction describes an oxidation, where the diol is oxidized by PCC to form a diketone or an aldehyde, depending on the specifics of the reaction conditions and structure.

These reactions showcase common transformations in organic synthesis, demonstrating mechanisms such as electrophilic aromatic substitution, ylide formation, and selective oxidation.
Transcribed Image Text:### Organic Chemistry Reaction Pathways #### Reaction 1: - **Starting Material:** A benzene ring attached to a propyl chloride group. - **Reagents:** 1. Aluminum chloride (AlCl₃) 2. Water (H₂O) This reaction represents a Friedel-Crafts alkylation where the aluminum chloride acts as a catalyst to facilitate the formation of a carbocation, leading to the alkylation of the benzene ring. #### Reaction 2: - **Starting Material:** Cyclohexyl bromide. - **Reagents:** 1. Triphenylphosphine (PPh₃) 2. Butyllithium (BuLi) 3. Cyclopentanone This sequence suggests a Wittig reaction pathway. The phosphonium salt formation with PPh₃ and BuLi allows for the generation of an ylide, which then reacts with the cyclopentanone to form an alkene. #### Reaction 3: - **Starting Material:** 1,2-cyclohexanediol - **Reagents:** - Excess pyridinium chlorochromate (PCC) This reaction describes an oxidation, where the diol is oxidized by PCC to form a diketone or an aldehyde, depending on the specifics of the reaction conditions and structure. These reactions showcase common transformations in organic synthesis, demonstrating mechanisms such as electrophilic aromatic substitution, ylide formation, and selective oxidation.
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