26.07.2021 Views

General Chemistry Principles, Patterns, and Applications, 2011

General Chemistry Principles, Patterns, and Applications, 2011

General Chemistry Principles, Patterns, and Applications, 2011

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

Figure 24.5 Potential Energy Plot <strong>and</strong> Newman Projections of Eclipsed <strong>and</strong> Staggered<br />

Conformations of n-Butane<br />

In these projections, the molecule is viewed along the C2–C3 axis. The least stable structure is the<br />

eclipsed conformation in which the two methyl groups (C1 <strong>and</strong> C4) are adjacent to each other. The<br />

most stable structure is the staggered conformation in which the methyl groups are as far apart as<br />

possible. Because the substituents on each central carbon atom are not all the same, a 120° rotation<br />

about the C2–C3 bond generates energetically nonequivalent eclipsed <strong>and</strong> staggered<br />

conformations.<br />

E X A M P L E 1<br />

Draw Newman projections showing the staggered <strong>and</strong> eclipsed conformations of 1,1,1-trichloroethane<br />

(CCl 3CH 3).<br />

Given: organic molecule<br />

Saylor URL: http://www.saylor.org/books<br />

Saylor.org<br />

2210

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!