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Ch. 3 - Alkanes and Cycloalkanes: Properties and Conformational Analysis
Mullins - Organic Chemistry: A Learner Centered Approach 1st Edition
Mullins1st EditionOrganic Chemistry: A Learner Centered ApproachISBN: 9780137566471Not the one you use?Change textbook
All textbooksMullins 1st EditionCh. 3 - Alkanes and Cycloalkanes: Properties and Conformational AnalysisProblem 53j
Chapter 2, Problem 53j

Given the following structures, show the Newman projection that would result from looking down the indicated bond in the direction shown. [Orient yourself as if you were the eyeball looking down the bond. Some of the examples have been partially completed for you to fill in the rest.]
(j) <IMAGE>

Verified step by step guidance
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Step 1: Identify the bond you are looking down. In this case, the bond is between the two central carbons, as indicated by the arrow pointing to the right.
Step 2: Orient yourself as the 'eyeball' looking down the bond. The front carbon (closest to the eye) will have three substituents radiating out, and the back carbon (furthest from the eye) will also have three substituents radiating out.
Step 3: For the front carbon, note the substituents attached to it. Based on the diagram, the front carbon has a bromine (Br) on a wedge, a hydrogen (H) on a dash, and a methyl group (CH3) in the plane of the paper.
Step 4: For the back carbon, note the substituents attached to it. The back carbon has a bromine (Br) on a dash, a hydrogen (H) on a wedge, and a methyl group (CH3) in the plane of the paper.
Step 5: Draw the Newman projection. Represent the front carbon as a circle with its substituents radiating out (Br on top, CH3 to the right, H to the left). Represent the back carbon as a circle behind the front carbon, with its substituents radiating out (Br on top, CH3 to the left, H to the right). Ensure the stereochemistry (wedge and dash) is correctly reflected in the projection.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Newman Projections

Newman projections are a way to visualize the conformation of a molecule by looking straight down a bond connecting two carbon atoms. This representation helps in understanding the spatial arrangement of substituents around the bond, which is crucial for analyzing steric interactions and torsional strain in organic compounds.
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00:34
Introduction to Drawing Newman Projections

Conformational Analysis

Conformational analysis involves studying the different spatial arrangements of atoms in a molecule that can be interconverted by rotation around single bonds. This analysis is essential for predicting the stability of various conformers, as certain arrangements may lead to increased steric hindrance or torsional strain, affecting the molecule's reactivity and properties.
Recommended video:
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Understanding what a conformer is.

Substituent Orientation

The orientation of substituents in a Newman projection is critical for understanding the molecule's behavior. In the provided structure, the positioning of bromine atoms relative to each other can influence steric interactions, which can affect the overall stability and reactivity of the molecule. Recognizing how substituents are arranged helps in predicting potential reactions and conformational preferences.
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Nucleophiles and Electrophiles can react in Substitution Reactions.
Related Practice
Textbook Question

Given the following structures, show the Newman projection that would result from looking down the indicated bond in the direction shown. [Orient yourself as if you were the eyeball looking down the bond. Some of the examples have been partially completed for you to fill in the rest.]

(b) <IMAGE>

998
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Textbook Question

Given the following structures, show the Newman projection that would result from looking down the indicated bond in the direction shown. [Orient yourself as if you were the eyeball looking down the bond. Some of the examples have been partially completed for you to fill in the rest.]

(l) <IMAGE>

1431
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Textbook Question

For each of the following structures, which staggered Newman projection skeleton from Assessment 3.51 should you draw first to show what is seen when looking down the indicated bond?

(d) <IMAGE>

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Textbook Question

Given the following structures, show the Newman projection that would result from looking down the indicated bond in the direction shown. [Orient yourself as if you were the eyeball looking down the bond. Some of the examples have been partially completed for you to fill in the rest.]

(i) <IMAGE>

876
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Textbook Question

For each pair of conformations shown, choose which is most stable. [If both conformations have the same number of gauche interactions, choose the one where the interactions are between smaller groups.]

(e)

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Textbook Question

Given the following structures, show the Newman projection that would result from looking down the indicated bond in the direction shown. [Orient yourself as if you were the eyeball looking down the bond. Some of the examples have been partially completed for you to fill in the rest.]

(k) <IMAGE>

1519
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