4.5 Newman Projections | Organic Chemistry

Chad explains how to draw Newman projections for butane and 2-chlorobutane from bond line structures. He begins by providing a 3D model of butane and matching up the staggered conformations and eclipsed conformations of the model with the corresponding Newman projections. He points out the anti conformation and gauche conformations of butane and further explains the definition of a gauche interaction and its relevance for determining relative energies between the different staggered conformations for the conformational analysis of alkanes. Chad explains how steric strain and torsional strain are responsible for these energy differences and stability of the various conformers. He finishes the lesson by showing how to determine the lowest energy conformation of 2-chlorobutane by comparing the number of gauche interactions in each staggered conformation and the sizes of the groups involved in these interactions.

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00:00 Lesson Introduction
00:59 Newman Projections of Butane (Conformational Analysis)
05:08 Newman Projections of 2-Chlorobutane (Conformational Analysis)

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