Starting from the structure below (sighting down the indicated bond). rotate the back carbon to provide an eclipsed conformer of the structure. Ph H H Hill CH₂CH3 H Draw Newman Projection

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### Understanding Conformational Analysis: Newman Projections

#### Objective:
Using the provided molecular structure, rotate the back carbon around the indicated bond to achieve an eclipsed conformer of the molecule. Draw the resulting Newman Projection in the space provided.

#### Steps and Explanation:

1. **Identify the Indicated Bond:**
   The structure shows a specific bond, illustrated with a dashed line and arrow, that you will sight down to draw the Newman Projection.

2. **Understanding the Newman Projection:**
   A Newman Projection is a method to visualize the conformation of a molecule from a specific vantage point along a carbon-carbon bond axis. This type of illustration helps in analyzing the spatial orientation of substituents around the two carbons involved in the bond.

3. **Rotation to Eclipsed Conformation:**
   In this task, you will rotate the atoms attached to the back carbon (the carbon farther from your viewpoint) such that their bonds directly overlap with the bonds of the atoms attached to the front carbon (the carbon closer to your viewpoint). This overlapping alignment is known as the eclipsed conformation.

4. **Structure Analysis:**

   - **Front Carbon Substituents:**
      - Phenyl group (Ph)
      - Two hydrogen atoms

   - **Back Carbon Substituents:**
      - Ethyl group (CH2CH3)
      - Two hydrogen atoms

#### Diagram:

1. **Sight Down the Indicated Bond:**

   From the diagram, you can visualize how the substituents are arranged around the carbon atoms.
   
2. **Eclipsed Conformer:**

   To draw the Newman Projection:
   - The front carbon atom will have the Phenyl group and two hydrogen atoms.
   - The back carbon atom will have the Ethyl group directly behind the Phenyl group and two hydrogen atoms directly behind the hydrogen atoms of the front carbon.

3. **Draw the Newman Projection:**
   - In the space provided, sketch two circles representing the front and back carbon atoms.
   - Label the substituents ensuring that the positions for the back carbon directly overlap with those of the front carbon to represent the eclipsed conformation.

**Note:** Newman Projections are a valuable tool for chemists to study the steric interactions and understand the stability of different conformers in organic molecules.

#### Tasks:

- **Rotate the Back Carbon:**
  Move the substituents into the eclipsed position.

- **Draw the
Transcribed Image Text:### Understanding Conformational Analysis: Newman Projections #### Objective: Using the provided molecular structure, rotate the back carbon around the indicated bond to achieve an eclipsed conformer of the molecule. Draw the resulting Newman Projection in the space provided. #### Steps and Explanation: 1. **Identify the Indicated Bond:** The structure shows a specific bond, illustrated with a dashed line and arrow, that you will sight down to draw the Newman Projection. 2. **Understanding the Newman Projection:** A Newman Projection is a method to visualize the conformation of a molecule from a specific vantage point along a carbon-carbon bond axis. This type of illustration helps in analyzing the spatial orientation of substituents around the two carbons involved in the bond. 3. **Rotation to Eclipsed Conformation:** In this task, you will rotate the atoms attached to the back carbon (the carbon farther from your viewpoint) such that their bonds directly overlap with the bonds of the atoms attached to the front carbon (the carbon closer to your viewpoint). This overlapping alignment is known as the eclipsed conformation. 4. **Structure Analysis:** - **Front Carbon Substituents:** - Phenyl group (Ph) - Two hydrogen atoms - **Back Carbon Substituents:** - Ethyl group (CH2CH3) - Two hydrogen atoms #### Diagram: 1. **Sight Down the Indicated Bond:** From the diagram, you can visualize how the substituents are arranged around the carbon atoms. 2. **Eclipsed Conformer:** To draw the Newman Projection: - The front carbon atom will have the Phenyl group and two hydrogen atoms. - The back carbon atom will have the Ethyl group directly behind the Phenyl group and two hydrogen atoms directly behind the hydrogen atoms of the front carbon. 3. **Draw the Newman Projection:** - In the space provided, sketch two circles representing the front and back carbon atoms. - Label the substituents ensuring that the positions for the back carbon directly overlap with those of the front carbon to represent the eclipsed conformation. **Note:** Newman Projections are a valuable tool for chemists to study the steric interactions and understand the stability of different conformers in organic molecules. #### Tasks: - **Rotate the Back Carbon:** Move the substituents into the eclipsed position. - **Draw the
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