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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  • @rohitdutta8458
    @rohitdutta845810 ай бұрын

    You mentioned Gauche interactions occur when you have two interactions that do not involve H atoms. How come CH3 and CH3 result in a gauche interaction? When in the video you said CH3 + H is NOT a gauche, 11:09

  • @ChadsPrep

    @ChadsPrep

    10 ай бұрын

    Hi Rohit! In a staggered conformation, if either of the two adjacent groups is a hydrogen atom, then it NOT a gauche interaction. Ultimately, both groups need to be larger than a single hydrogen atom for it to be labeled as a gauche interaction. So H + H or CH3 + H would not be considered gauche interactions because at least 1 of the 2 adjacent groups is a single H atom. But CH3 + CH3 is a gauche interaction as the 2 adjacent groups interacting are definitely both larger than a single H atom. Hope this helps!

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