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Ch. 3 - Alkanes and Cycloalkanes: Properties and Conformational Analysis
Mullins - Organic Chemistry: A Learner Centered Approach 1st Edition
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Tutti i libri di testoMullins 1st EditionCh. 3 - Alkanes and Cycloalkanes: Properties and Conformational AnalysisProblema 53i
Capitolo 2, Problema 53i

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>

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Orient yourself as the 'eyeball' looking directly down the indicated bond. Identify the front carbon (closest to the eye) and the back carbon (furthest from the eye) along the bond axis.
Draw a circle to represent the back carbon atom. The front carbon atom will be represented by a dot in the center of the circle.
Identify the three substituents attached to the front carbon. Arrange them as lines radiating outward from the central dot, spaced at 120° angles. Ensure their positions match the 3D structure of the molecule.
Identify the three substituents attached to the back carbon. Arrange them as lines radiating outward from the edge of the circle, spaced at 120° angles. Ensure their positions match the 3D structure of the molecule.
Double-check the relative positions of all substituents to ensure the Newman projection accurately represents the stereochemistry of the molecule as viewed down the bond.

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Newman Projections

Newman projections are a way to visualize the conformation of a molecule by looking straight down a bond between two carbon atoms. This representation helps in understanding the spatial arrangement of substituents attached to the carbons, allowing for the analysis of steric interactions and torsional strain in different conformations.
Video consigliato:
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 crucial 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.
Video consigliato:
03:29
Understanding what a conformer is.

Steric Hindrance

Steric hindrance refers to the repulsion between atoms or groups within a molecule that occurs when they are brought close together. In the context of Newman projections, understanding steric hindrance is essential for evaluating the stability of different conformations, as bulky groups can create unfavorable interactions that influence the preferred conformation of the molecule.
Video consigliato:
02:53
Understanding steric effects.
Pratica correlata
Domanda del libro di testo

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>

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Domanda del libro di testo

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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Domanda del libro di testo

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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Domanda del libro di testo

Given the first Newman projection and the direction and degree of rotation, fill in the resulting Newman projection. [One substituent has been labeled for you.]

(l)

1451
views
Domanda del libro di testo

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>

1364
views
Domanda del libro di testo

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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