aromatic compounds

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10 Terms

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aliphatic

compounds not containing a benzene ring

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benzene

the simplest aromatic

flat 6 membered ring

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nomenclature of benzene derivatives

  • some named after substituents

  • some named after parent compound

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bonding in benzene

carbon atoms are sp2 hybridised

  • overlap of these hybrids gives sigma bonds

pi bonding is not localised

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criteria to be aromatic

  1. planar

  2. conjugated

  3. rings

  4. 4n + 2pi electrons

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stabilisation and reactivity

aromatic are nucleophilic

relatively unreactive

substitution reactions

reactions are slow and require a catalyst

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mechanism - step1

2 electrons from delocalised pi system are donated to form a bond to the electrophilic reagent

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step 2

a H+ ion is lost restoring aromaticity

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haloaromatics as electrophiles

not good

Sn2 is near impossible

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