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To be aromatic:
a 7 member ring must be ___1
a 5 emmber ring must be ___2
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Physical characteristics of aromatic compounds
- 1. higher bp
- 2. more polar
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Requirements for aromatic compounds
- cyclic
- every atom in ring must have pi bond
- flat
- 4N+2 pi electrons (2, 6, 10, 14, 18)
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Requirements for antiaromatic compounds
- cyclic
- all atoms in ring must have pi orbitals
- flat
- 4N pi electrons (4,8,12,16)
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Imidazole
one basic N
one not so basic N
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Positions: ortho, meta, para
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Lowest to highest boiling point and melting point
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In benzine:
IR C=C & C-H
NMS
MS
- IR: C=C 1600 & C-H 3000
- NMS: 7-8
- MS: break between C attached to ring and other C. peak at 91
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Even thoug they don't have double bonds, what two members of a ring can aid in aromacity?
carbocations and B
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