A. Build the ethane molecule. Rotate the molecule around the C-C bond to view the staggered and eclipsed conformers. Draw the sawhorse projection and the Newman projection in the table below. Sawhorse Newman Staggered Conformation Eclipsed Conformation B. Build the butane molecule (CH3CH2CH2CH3). Sighting down the C2-C3 bond, draw the Newman projections of the four conformers that correspond to the local maxima and minima in the energy diagram (i.e. gauche, anti, etc.). Draw the energy diagram and calculate the energy differences. The Y-axis is energy and the X-axis is degrees of rotation, which represents the dihedral angle between C1, C2 and C3. When rotating, keep C2 stationery, and rotate C3

Organic Chemistry: A Guided Inquiry
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ISBN:9780618974122
Author:Andrei Straumanis
Publisher:Andrei Straumanis
Chapter3: Electron Orbitals
Section: Chapter Questions
Problem 2E: Explain why the two molecules below cannot inter-convert without breaking the portion of thedouble...
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Organic molecules are 3-dimensional, although it is sometimes easy to forget this when we see
them in 2 dimensions on a sheet of paper or a blackboard. The purpose of this experiment is to
familiarize you with the 3-dimensional structure of molecules, and to familiarize you with
manipulating those structures. We will do this using a molecular modeling kit.
A. Build the ethane molecule. Rotate the molecule around the C-C bond to view the staggered and
eclipsed conformers. Draw the sawhorse projection and the Newman projection in the table
below.
Sawhorse
Newman
Staggered
Conformation
Eclipsed
Conformation
B. Build the butane molecule (CH3CH2CH2CH3). Sighting down the C2-C3 bond, draw the Newman
projections of the four conformers that correspond to the local maxima and minima in the
energy diagram (i.e. gauche, anti, etc.). Draw the energy diagram and calculate the energy
differences. The Y-axis is energy and the X-axis is degrees of rotation, which represents the
dihedral angle between C1, C2 and C3. When rotating, keep C2 stationery, and rotate C3
Transcribed Image Text:Organic molecules are 3-dimensional, although it is sometimes easy to forget this when we see them in 2 dimensions on a sheet of paper or a blackboard. The purpose of this experiment is to familiarize you with the 3-dimensional structure of molecules, and to familiarize you with manipulating those structures. We will do this using a molecular modeling kit. A. Build the ethane molecule. Rotate the molecule around the C-C bond to view the staggered and eclipsed conformers. Draw the sawhorse projection and the Newman projection in the table below. Sawhorse Newman Staggered Conformation Eclipsed Conformation B. Build the butane molecule (CH3CH2CH2CH3). Sighting down the C2-C3 bond, draw the Newman projections of the four conformers that correspond to the local maxima and minima in the energy diagram (i.e. gauche, anti, etc.). Draw the energy diagram and calculate the energy differences. The Y-axis is energy and the X-axis is degrees of rotation, which represents the dihedral angle between C1, C2 and C3. When rotating, keep C2 stationery, and rotate C3
clockwise. Start with a dihedral angle of 0°. Also label the extrema in the energy diagram with
the name of each conformer.
Conformer 1
Conformer 2
Conformer 3
Conformer 4
Transcribed Image Text:clockwise. Start with a dihedral angle of 0°. Also label the extrema in the energy diagram with the name of each conformer. Conformer 1 Conformer 2 Conformer 3 Conformer 4
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