May 18 Pre Class Resonance Aromaticity Functional Groups.pdf

C what is the hybridiza on of the n atom in the amide

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electrons par-cipate in resonance. c. What is the hybridiza-on of the N atom in the amide func-onal group? d. The lone pair of the N atom is hybridized into a ____ orbital. e. What is the geometry of the C atom and the N atom of an amide? Concept exercise N O
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Learning objec-ves • Define aroma-city • Determine whether a chemical species is aroma-c • Describe the reduced reac-vity/increased stability of aroma-c compounds NOTE: Things are either ‘aroma/c’ or ‘not aroma/c’. In the answer key, think of an/-aroma/c = not aroma/c AromaAcity
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• Benzene and deriva-ves with pleasant odors were labeled as aroma-c • The modern defini-on of an aroma-c compound is a cyclic compound that is more stable than expected – Many are odorless • The stability comes from the orbital structure, with the right number of electrons in the pi system, all the bonding molecular orbitals are filled, while the an-bonding orbitals are empty (you do not need to go beyond this for 233 but you can look at the MO diagrams on page 759 if you want to read more). What is aromaAcity?
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Examples of compounds with aromaAc moieAes
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• Two criteria 1. A ring comprised of con-nuously overlapping p orbitals • This means the ring must be planar • Each atom in the ring must contain an unhybridized p orbital 2.
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