a) b) d) Br₂/H₂O DMSO Br₂ 1) OsO4 2NaHSO3/H₂0 H₂ Pd, 3 atm

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Show the product(s) of each of the following reactants. If a chiral center is formed, label it as R or S.

### Organic Chemistry Reaction Mechanisms

In this section, we explore different organic reactions, specifically focusing on mechanisms involving alkenes. We will discuss the transformations indicated in the following reaction schemes:

#### a) Reaction with Bromine and Water
- **Starting Material**: An alkene with a double bond between carbon atoms.
- **Reagents**: 
  - Bromine (Br₂)
  - Water (H₂O)
  - Solvent: Dimethyl sulfoxide (DMSO)
- **Reaction**: The alkene undergoes bromohydration where one bromine atom and a hydroxyl group add to the carbons of the former double bond in a regioselective manner.

#### b) Bromination of a Cycloalkene
- **Starting Material**: A cycloalkene.
- **Reagent**: Bromine (Br₂)
- **Reaction**: The bromine adds across the double bond of the cycloalkene, resulting in a vicinal dibromide, where both bromine atoms are added to adjacent carbon atoms.

#### c) Dihydroxylation with Osmium Tetroxide
- **Starting Material**: An alkene with a double bond between carbon atoms.
- **Reagents**: 
  - Osmium tetroxide (OsO₄)
  - Sodium bisulfite (2NaHSO₃) in water (H₂O)
- **Reaction**: The alkene undergoes syn-dihydroxylation where two hydroxyl groups are added to the same side of the former double bond.

#### d) Hydrogenation of a Cycloalkene
- **Starting Material**: A cycloalkene.
- **Reagent and Conditions**: 
  - Hydrogen gas (H₂)
  - Palladium catalyst (Pd) under 3 atmospheres of pressure
- **Reaction**: The cycloalkene undergoes catalytic hydrogenation, which results in the addition of hydrogen across the double bond, rendering a saturated cycloalkane.

These reactions illustrate different ways alkenes can undergo addition reactions to form more complex molecules, contributing greatly to the fields of synthetic and medicinal chemistry.
Transcribed Image Text:### Organic Chemistry Reaction Mechanisms In this section, we explore different organic reactions, specifically focusing on mechanisms involving alkenes. We will discuss the transformations indicated in the following reaction schemes: #### a) Reaction with Bromine and Water - **Starting Material**: An alkene with a double bond between carbon atoms. - **Reagents**: - Bromine (Br₂) - Water (H₂O) - Solvent: Dimethyl sulfoxide (DMSO) - **Reaction**: The alkene undergoes bromohydration where one bromine atom and a hydroxyl group add to the carbons of the former double bond in a regioselective manner. #### b) Bromination of a Cycloalkene - **Starting Material**: A cycloalkene. - **Reagent**: Bromine (Br₂) - **Reaction**: The bromine adds across the double bond of the cycloalkene, resulting in a vicinal dibromide, where both bromine atoms are added to adjacent carbon atoms. #### c) Dihydroxylation with Osmium Tetroxide - **Starting Material**: An alkene with a double bond between carbon atoms. - **Reagents**: - Osmium tetroxide (OsO₄) - Sodium bisulfite (2NaHSO₃) in water (H₂O) - **Reaction**: The alkene undergoes syn-dihydroxylation where two hydroxyl groups are added to the same side of the former double bond. #### d) Hydrogenation of a Cycloalkene - **Starting Material**: A cycloalkene. - **Reagent and Conditions**: - Hydrogen gas (H₂) - Palladium catalyst (Pd) under 3 atmospheres of pressure - **Reaction**: The cycloalkene undergoes catalytic hydrogenation, which results in the addition of hydrogen across the double bond, rendering a saturated cycloalkane. These reactions illustrate different ways alkenes can undergo addition reactions to form more complex molecules, contributing greatly to the fields of synthetic and medicinal chemistry.
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