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Eclipsed Conformation

Article ID: 49
Last updated: 12 Jul, 2011
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Eclipsed conformations of alkanes usually represent the highest energy conformation where the bonds on adjacent atoms are exactly aligned with each other, thereby increasing steric/torsional strain. Below are representations of eclipsed conformations in both Newman projections and wedge-and-dash drawings of ethane.  Larger alkanes, such as butane, contain multiple different types of eclipsed conformations.  The highest energy conformation of butane eclipses the largest substituents (methyl groups) across the "important" bond (C2-C3 in butane's case) being studied.

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Department of Chemistry & Chemical Biology