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  Ethane Homework Help - K-12 Grade Level, College Level Chemistry

Introduction of Ethane Conformers

A good introduction to conformational analysis can be presented by simple alkane ethane. Now, there is only one carbon-carbon bond and the rotational structures (rotamers) that it may assume fall among two extremes that are eclipsed and staggered. In the subsequent explanation of these conformers, various structural notations are employed. The first views the ethane molecule from the side, with carbon-carbon bond being horizontal to the viewer. By hatched (behind the plane) and wedge (in front of the plane) bonds the hydrogens are then located in the nearby space. If this structure is rotated therefore that carbon #1 is canted down and brought closer to the viewer, the projection of "sawhorse" is presented. At last, if the viewer looks down the carbon-carbon bond with carbon #1 in front of #2, the Newman projection is observed.

Newman is come into existence due to his research on the polynuclear aromatic hydrocarbons where he developed new synthetic methods and explored structural effects on their carcinogenicity. Results are summarized in book that he co-authored on "The Chemistry and Biology of Benz[a] anthracenes" (year 1988). Newman displayed that the steric hindrance and overcrowding distorted aromatic framework from planarity causing it to become helically chiral. This work was crowned with resolution and synthesis of hexahelicene (in the year1956). Newman's book "Steric Effects in Organic Chemistry" (1956) encouraged interest in this field. His research interests ranged widely; in this portrait he holds a model of vinylene carbonate, a compound he first synthesized (1953) and used as a dienophile and monomer.

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The result of bond-electron repulsions, demonstrated on the right above, than the staggered conformation the eclipsed conformation is less stable, by roughly 3 kcal / mol (eclipsing strain). The strict repulsions in the eclipsed conformation are represented by the red arrows. There are 6 other less strong repulsions that are not shown. There are six equal bond repulsions in the staggered conformation, four of which are depicted by the blue arrows, and these are all considerably less severe than the three strongest eclipsed repulsions. Subsequently, the potential energy that is associated with the several conformations of ethane changes with the dihedral angle of the bonds, as shown below in the diagram. Even though the conformers of ethane are in rapid equilibrium with each other, the 3 kcal/mol energy variation leads to a substantial preponderance of staggered conformers (> 99.9%) at any given time.

Ethane, which is contained of two methyl groups attached to each other, has the properties that are very identical to those of methane. Even though, the complete 3-D shape of ethane cannot be specified by these bond angles and bond lengths alone, since ethane can internally rotate about its C-C bond.

To understand why the ethane has this extra degree of freedom, think about cylindrically symmetric nature of $\sigma$ bonds. $\sigma$ bond can preserve a full degree of overlap while its two ends rotate. So, the energetic barrier to rotation about sigma bonds is usually very low. Not like $\pi$ bonds in the alkenes, the C-C sigma bond does not hold the two methyl groups in fixed positions relative to one another. Distinct spatial arrangements formed by rotations about a single bond are called conformers or conformations.

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