CH-2240 Lecture Notes - Lecture 7: Benzene, Acid Dissociation Constant, Electronegativity
27 Nov 2017
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Chapter 7 delocalized electrons and their effect on stability, reactivity, and pka. More about molecular orbital theory: localized electrons restricted to a particular region, delocalized shared by three or more atoms. 7. 1 delocalized electrons explain benzene"s structure: benzene c6h6, degree unsaturation = 4 means it has 4 pi bonds. 7. 2 the bonding in benzene: carbon sp2 orbitals overlap with 2 carbons and 1 hydrogen. 7. 3 resonance contributors and the resonance hybrid: circle inside the ring shows that all the bonds are the same length structure approximate structure with localized electrons, resonance hybrid actual structure with delocalized electrons. 7. 5 the predicted stabilities of resonance contributors: some molecules have separated charges a negative charge and a positive, when e-s can move in more than one direction most stability comes from. 7. 6 delocalization energy is the additional stability delocalized electrons give to a charge that can be neutralized by the movement of electrons.
