6. Provide the missing starting materials, reagents, or products, as needed. If you are supplying the products, make sure to show all major organic products, indicating stereochemistry if necessary. If no reaction would occur, write "NR."

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**Organic Chemistry Reaction Mechanisms**

**6. Provide the missing starting materials, reagents, or products, as needed. If you are supplying the products, make sure to show all major organic products, indicating stereochemistry if necessary. If no reaction would occur, write "NR."**

a)
- **Reagents:** H₂ (xs), Pt
- **Reaction:** This is a hydrogenation reaction where excess hydrogen gas in the presence of a platinum catalyst converts an alkyne to an alkane.

b)
- **Reagents:** 
  1. Hg(OAc)₂, H₂O
  2. NaBH₄
- **Reaction:** This is an oxymercuration-demercuration reaction which converts an alkene to an alcohol.

c)
- **Reagents:** mCPBA, CH₂Cl₂
- **Reaction:** The given reagent, meta-Chloroperoxybenzoic acid (mCPBA), in dichloromethane (CH₂Cl₂), is used for epoxidation which converts an alkene to an epoxide.

d)
- **Reagents:**
  1. BH₃ / THF
  2. NaOH, H₂O₂, H₂O
- **Reaction:** This is a hydroboration-oxidation reaction, which converts an alkene to an alcohol with anti-Markovnikov orientation.

e)
- **Reagents:**
  1. OsO₄, THF, rt
  2. Me₂S
- **Reaction:** This is a dihydroxylation reaction which converts an alkene to a vicinal diol (two hydroxyl groups on adjacent carbons).

f)
- **Reagents:**
  - H⁺
- **Reaction:** This is an acid-catalyzed hydration-dehydration equilibrium leading to the formation of a more thermodynamically stable product, typically an alkene.

g)
- **Reagents:** HBr, H₂O₂, Δ
- **Reaction:** This is a radical addition of HBr to a cycloalkene which follows the anti-Markovnikov rule due to the presence of peroxides.

h)
- **Reagents:**
  1. O₃
  2. Me₂S
- **Reaction:** This is an ozonolysis reaction which cleaves an alkene to give carbon
Transcribed Image Text:**Organic Chemistry Reaction Mechanisms** **6. Provide the missing starting materials, reagents, or products, as needed. If you are supplying the products, make sure to show all major organic products, indicating stereochemistry if necessary. If no reaction would occur, write "NR."** a) - **Reagents:** H₂ (xs), Pt - **Reaction:** This is a hydrogenation reaction where excess hydrogen gas in the presence of a platinum catalyst converts an alkyne to an alkane. b) - **Reagents:** 1. Hg(OAc)₂, H₂O 2. NaBH₄ - **Reaction:** This is an oxymercuration-demercuration reaction which converts an alkene to an alcohol. c) - **Reagents:** mCPBA, CH₂Cl₂ - **Reaction:** The given reagent, meta-Chloroperoxybenzoic acid (mCPBA), in dichloromethane (CH₂Cl₂), is used for epoxidation which converts an alkene to an epoxide. d) - **Reagents:** 1. BH₃ / THF 2. NaOH, H₂O₂, H₂O - **Reaction:** This is a hydroboration-oxidation reaction, which converts an alkene to an alcohol with anti-Markovnikov orientation. e) - **Reagents:** 1. OsO₄, THF, rt 2. Me₂S - **Reaction:** This is a dihydroxylation reaction which converts an alkene to a vicinal diol (two hydroxyl groups on adjacent carbons). f) - **Reagents:** - H⁺ - **Reaction:** This is an acid-catalyzed hydration-dehydration equilibrium leading to the formation of a more thermodynamically stable product, typically an alkene. g) - **Reagents:** HBr, H₂O₂, Δ - **Reaction:** This is a radical addition of HBr to a cycloalkene which follows the anti-Markovnikov rule due to the presence of peroxides. h) - **Reagents:** 1. O₃ 2. Me₂S - **Reaction:** This is an ozonolysis reaction which cleaves an alkene to give carbon
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