May 18 Pre Class Resonance Aromaticity Functional Groups.pdf

The number of pi electrons is a hückel number

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The number of pi electrons is a Hückel number • Hückel’s rule: 4n + 2 π electrons, where n is an integer – Thus, the Hückel’s numbers are 2, 6, 10, and so on AromaAcity definiAon
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Benzene H H H H H H
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Determine whether the following are aroma-c or not. Note: We will not cover an/-aroma/city in CHEM 233, so you can ignore this concept completely. PracAce H H H H H
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Complete the following table. Exercise: compounds containing nitrogen in the ring What is the hybridization of N atom(s)? a: b: What is the local geometry of N atom(s)? a: b: The N lone pair is in a [blank] hybrid orbital. a: b: aromatic? N H N N H N N H a b
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pyridine pyrrole
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Why does this ma8er?
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Which are aroma-c? ApplicaAon/generalizaAon N O O OCH 3 N N O N H N N N A B C D E F G H J K L I
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Draw resonance structures to determine the hybridiza-on of an atom in the resonance hybrid, which may differ from how it appears when drawn as a single line-bond structure • When we ask for hybridiza-on of an atom, we are asking about atom’s structure in the resonance hybrid Key Points/strategies
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Learning objec-ves IdenAfy funcAonal groups in chemical species as a group of atoms/bonds that possess a predictable chemical behaviour (alkyl halide, alkene, alkyne, alcohol, ether, thiol, sulfide , arene, ketone,
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