Open Yale CoursesCHEM 125: Freshman Organic ChemistryLecture 15 - Chemical Reactivity: SOMO, HOMO, and LUMO<< previous session| next session >>Overview:Professor McBride begins by using previous examples of "pathological" bonding and the BH3molecule toillustrate how a chemist's use of localized bonds, vacant atomic orbitals, and unshared pairs to understandmolecules compares with views based on the molecule's own total electron density or on computationalmolecular orbitals. This lecture then focuses on understanding reactivity in terms of the overlap of singly-occupied molecular orbitals (SOMOs) and, more commonly, of an unusually high-energy highest occupiedmolecular orbital (HOMO) with an unusually low-energy lowest unoccupied molecular orbital (LUMO). Thisis shown to be a generalization of the traditional concepts of acid and base. Criteria for assessing reactivityare outlined and illustrated.Problem sets/Reading assignment:Reading assignments, problem sets, PowerPoint presentations, and other resources for this lecture can be
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