Exploring Conformational Analysis using Molecular Models
1. Draw
the molecule methane using the wedge and dash depiction
2. Draw ethane in wedge and dash depiction,
sawhorse depiction and in its Newman projection. Show both eclipsed and anti
forms.
Click on the image to enlarge
3. Draw butane in wedge and dash depiction,
sawhorse depiction and in its Newman projection looking down the 2,3 bond. Show
eclipse, gauche and anti forms.
Click on the image to enlarge
4. Draw all Newman projections of 2-methylhexane
showing eclipsed, gauche and anti forms. Rotate about the 3,4 carbon-carbon
bond and watch what happens to the groups. Draw a potential energy diagram for
the rotation about the 3,4 carbon-carbon bond plotting Potential Energy versus
Torsion Angle.
Click on image to enlarge
5. Draw cyclopropane and cyclobutane in three
dimensions, be sure to include the hydrogen atoms.
Cyclopropane
Cyclobutane
6.
Draw the chair form of cyclohexane.
7.
Draw the following molecules twice, once using
the chair conformation AND once using the wedge and dash depiction.
1,2
cis-dimethylcyclohexane
1,2
trans-dibromocyclohexane
1,3
cis-dichlorocyclohexane
1,3
trans-dimethylcyclohexane
1,4
cis-dimethylcyclohexane
1,4
trans-dibromocyclohexane
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