Select the Newton Projection or Newton Projections that represent a conformation of 2,2-dimethylbutane sighting along any C-C bond. H₂C_2 H3C CH3 CH3

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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### Understanding Newman Projections in Organic Chemistry

Newman projections are a way to visualize the conformation of a molecule from a specific viewpoint. The following are diagrams of Newman projections illustrating different conformations of substituted ethanes.

#### Diagram 1
- **Center Circle:** Represents the carbon-carbon bond viewed down the axis.
- **Substituents:** 
  - Hydrogen atoms (H)
  - Methyl groups (Me)
  - Ethyl group (Et)

The first Newman projection shows the ethane molecule with two methyl groups and one ethyl group attached to the carbons at the front and rear of the depicted bond.

#### Diagram 2
- **Center Circle:** Represents the carbon-carbon bond viewed down the axis.
- **Substituents:**
  - Hydrogen atoms (H)
  - Tert-butyl group (tBu)

The second Newman projection shows the ethane molecule with a bulky tert-butyl group and hydrogen atoms attached to the carbons at the front and rear of the depicted bond.

#### Diagram 3
- **Center Circle:** Represents the carbon-carbon bond viewed down the axis.
- **Substituents:**
  - Hydrogen atoms (H)
  - Methyl groups (Me)

The third Newman projection displays the ethane molecule where carbons are substituted with multiple methyl groups and hydrogen atoms, giving a different perspective on conformational analysis.

These diagrams help by showing the spatial arrangement of substituents around the carbon-carbon bond, which is crucial for understanding the steric interactions that influence conformational stability in organic molecules. Each conformation can provide insights into chemical reactivity and physical properties of the molecule.
Transcribed Image Text:### Understanding Newman Projections in Organic Chemistry Newman projections are a way to visualize the conformation of a molecule from a specific viewpoint. The following are diagrams of Newman projections illustrating different conformations of substituted ethanes. #### Diagram 1 - **Center Circle:** Represents the carbon-carbon bond viewed down the axis. - **Substituents:** - Hydrogen atoms (H) - Methyl groups (Me) - Ethyl group (Et) The first Newman projection shows the ethane molecule with two methyl groups and one ethyl group attached to the carbons at the front and rear of the depicted bond. #### Diagram 2 - **Center Circle:** Represents the carbon-carbon bond viewed down the axis. - **Substituents:** - Hydrogen atoms (H) - Tert-butyl group (tBu) The second Newman projection shows the ethane molecule with a bulky tert-butyl group and hydrogen atoms attached to the carbons at the front and rear of the depicted bond. #### Diagram 3 - **Center Circle:** Represents the carbon-carbon bond viewed down the axis. - **Substituents:** - Hydrogen atoms (H) - Methyl groups (Me) The third Newman projection displays the ethane molecule where carbons are substituted with multiple methyl groups and hydrogen atoms, giving a different perspective on conformational analysis. These diagrams help by showing the spatial arrangement of substituents around the carbon-carbon bond, which is crucial for understanding the steric interactions that influence conformational stability in organic molecules. Each conformation can provide insights into chemical reactivity and physical properties of the molecule.
### Conformations of 2,2-Dimethylbutane

In this section, we explore different conformations of 2,2-dimethylbutane utilizing Newton Projections. Please select the Newton Projection(s) that accurately represent a conformation of 2,2-dimethylbutane, focusing on any Carbon-Carbon (C-C) bond.

### Molecular Structure Depiction

Above we have the molecular structure of 2,2-dimethylbutane. The carbon atoms are numbered from 1 to 4, and the molecule includes two methyl groups (-CH3) attached to carbon 2.

### Newton Projections

Below the molecular structure, two Newton Projections are shown:

1. **First Newton Projection:**
   - **Description:** This projection comprises a central carbon (seen from the front) bonded to three methyl groups (Me) and one hydrogen (H).
   - **Diagram Explanation:** The front carbon is represented by a dot with one methyl group at 12 o'clock, another at 4 o'clock, and a third at 8 o'clock. A hydrogen atom is pointing directly backward (away from the viewer).

2. **Second Newton Projection:**
   - **Description:** This projection includes a central carbon bonded to two methyl groups (Me) and two hydrogen atoms (H), with an ethyl group (Et) attached to the rear carbon.
   - **Diagram Explanation:** In this diagram, the central front carbon has a methyl group at 12 o'clock and another methyl group at 4 o'clock, with hydrogen atoms positioned at 8 o'clock and pointing backward. The rear carbon also bonds an ethyl group extending in a different direction.

### Interactive Learning

- **Task:** Review and analyze these projections. Use the information provided to determine which projection(s) accurately represent a conformation of 2,2-dimethylbutane along any C-C bond.

**Note:** Select the checkbox associated with your chosen projection(s).
Transcribed Image Text:### Conformations of 2,2-Dimethylbutane In this section, we explore different conformations of 2,2-dimethylbutane utilizing Newton Projections. Please select the Newton Projection(s) that accurately represent a conformation of 2,2-dimethylbutane, focusing on any Carbon-Carbon (C-C) bond. ### Molecular Structure Depiction Above we have the molecular structure of 2,2-dimethylbutane. The carbon atoms are numbered from 1 to 4, and the molecule includes two methyl groups (-CH3) attached to carbon 2. ### Newton Projections Below the molecular structure, two Newton Projections are shown: 1. **First Newton Projection:** - **Description:** This projection comprises a central carbon (seen from the front) bonded to three methyl groups (Me) and one hydrogen (H). - **Diagram Explanation:** The front carbon is represented by a dot with one methyl group at 12 o'clock, another at 4 o'clock, and a third at 8 o'clock. A hydrogen atom is pointing directly backward (away from the viewer). 2. **Second Newton Projection:** - **Description:** This projection includes a central carbon bonded to two methyl groups (Me) and two hydrogen atoms (H), with an ethyl group (Et) attached to the rear carbon. - **Diagram Explanation:** In this diagram, the central front carbon has a methyl group at 12 o'clock and another methyl group at 4 o'clock, with hydrogen atoms positioned at 8 o'clock and pointing backward. The rear carbon also bonds an ethyl group extending in a different direction. ### Interactive Learning - **Task:** Review and analyze these projections. Use the information provided to determine which projection(s) accurately represent a conformation of 2,2-dimethylbutane along any C-C bond. **Note:** Select the checkbox associated with your chosen projection(s).
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