Open Yale CoursesCHEM 125: Freshman Organic ChemistryLecture 33 - Conformational Energy and Molecular Mechanics<< previous session| next session >>Overview:Understanding conformational relationships makes it easy to draw idealized chair structures for cyclohexaneand to visualize axial-equatorial interconversion. After quantitative consideration of the conformationalenergies of ethane, propane, and butane, cyclohexane is used to illustrate the utility of molecular mechanicsas an alternative to quantum mechanics for estimating such energies. To give useful accuracy this empiricalscheme requires thousands of arbitrary parameters. Unlike quantum mechanics, it assigns strain to specificsources such as bond stretching, bending, and twisting, and van der Waals repulsion or attraction.Problem sets/Reading assignment:Reading assignments, problem sets, PowerPoint presentations, and other resources for this lecture can beaccessed from Professor McBride's on-campus course website, which was developed for his Fall 2008
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