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Lecture 10 - 2 Requires application of molecular orbital(MO...

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1 Reading for Wednesday Chapter 18: 18.1-18.4 Mon. 6:00-7:30 pm MAL 3092 Tues. 2:30-4:00 PM MAL 2007 Wed. 5:00-6:30 PM MAL 2001 Thurs. 9:30-10:50 AM MAL 1003 Sat. 11:00 AM-1:00 PM MAL 2007 PLUS Sessions THIS WEEK First Exam Thursday! February 17 th 6-7:30 PM 120 Budig *Exam Review Session* Tues. Feb. 15 6-7:30 pm (1001 MAL ) Chapter 17 Benzene and Aromatic Compounds Key examples with 6 π electrons: pyridine, pyrrole, imidazole, furan Recall the effect of conjugation on hybridization in X=Y-Z: systems!! Aromatic heterocycles (17.8C) Key examples with 6 π electrons: Cyclopentadienyl anion Cycloheptatrienyl cation (Tropylium ion) Aromatic ions (17.8D)
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Unformatted text preview: 2 Requires application of molecular orbital (MO) theory (to date we have been employing valence bond theory) Hückel simplified MO theory by ignoring σ bonds and looking only at π bonds. Basis of Huckel’s Rule (17.9) A set of n atomic orbitals forms n molecular orbitals When two p orbitals having the same phase overlap, a π bonding MO results When two p orbitals having opposite phases overlap, a π * anti-bonding MO results MO Theory basics (17.9) Ethylene π MOs Fig. 17.8 Benzene π MOs Fig. 17.9 The π-MOs of Benzene* *Courtesy of Dr. Gerald Lushington LUMOs HOMOs...
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