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Chem 341 - Conformations

by: Caroline Hurlbut

Chem 341 - Conformations Chem 341

Marketplace > Colorado State University > Chemistry > Chem 341 > Chem 341 Conformations
Caroline Hurlbut
GPA 3.7

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Molecule conformations and projections, staggered vs eclipsed energies.
Modern Organic Chemistry I
Anna Elizabeth Allen
Class Notes
Organic Chemistry
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This 3 page Class Notes was uploaded by Caroline Hurlbut on Sunday September 25, 2016. The Class Notes belongs to Chem 341 at Colorado State University taught by Anna Elizabeth Allen in Summer 2015. Since its upload, it has received 5 views. For similar materials see Modern Organic Chemistry I in Chemistry at Colorado State University.


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Date Created: 09/25/16
• ways of representing 3D space of tetrahedral molecules —wedge (towards the front) and dash (towards the back): frontal view of molecule —sawhorse: angled view of molecule —Newman projection: side view of molecule • conformations are different arrangements of atoms that are interconverted by a rotation about sigma bonds —conformers are the same molecule in different positions that often have different energies and are related by a sigma bond rotation —torsional strain: increase in energy caused by eclipsing interactions and can be relieved by rotating a bond hydrogens are anti (top and bottom) hydrogens are syn (front and back) • lowest energy conformation is when the atoms are as equally spaced out as possible —staggered conformation = low energy —eclipsed conformation = high energy levels of torsional strain represented in a graph: points on the graph are a series of maximums and minimums representing the increasing and decreasing torsional strain as the molecule is rotated • gauche - 2 groups 60˚ apart (energy penalty when 2 non-hydrogen groups are gauche) • steric strain - destabilization that occurs when atoms are forced close to one another and cannot be relieved with bond rotation levels of steric strain represented in a graph: • trends —largest groups eclipsing—>highest energy conformation —largest groups anti—>lowest energy conformation


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