Chapter 15 lecture note

Chapter 15 lecture note - Chemistry 0320 Spring 2008 Ch 15...

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Unformatted text preview: Chemistry 0320 Spring 2008 Ch 15 Benzene and Aromaticity page 1 Chapter 15: Benzene and Aromaticity Problem sets to skip :.61 This chapter is about the aromaticity of benzene and electrophilic aromatic substitution. 15-1 Nomenclature X X X Y Y Y 1,2- ortho- o- 1,3- meta- m- 1,4- para- p- benzene aromatic compounds 15- 2 Structure and Resonance Energy of Benzene Benzene does not behave like 1,3,5-cyclohexatriene: HCl Cl Cl Cl + + HCl Cl Pt, H 2 Pt, H 2 not like: Chemistry 0320 Spring 2008 Ch 15 Benzene and Aromaticity page 2 15-3 -Molecular Orbital of Benzene Chemistry 0320 Spring 2008 Ch 15 Benzene and Aromaticity page 3 15-4 Spectra of Aromatic Compounds To induce resonance, only ( H- h local ) is required; i.e. weaker external magnetic field Downfield shift C H 3 2.35 ppm C H 3 1.68 ppm 7.27 ppm H Chemistry 0320 Spring 2008 Ch 15 Benzene and Aromaticity page 4...
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Chapter 15 lecture note - Chemistry 0320 Spring 2008 Ch 15...

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