Aromatic compounds and their reactions

Aromatic compounds and their reactions

Multiple Choice

What makes a structure aromatic

• cyclic

• unsaturated

• conjugated

• delocalised

Multiple Select

Cyclic means

• being circular

• containing a ring

• being a ring

Hückel's Rule

(4n + 2) electrons delocalised

6, 10, 14, 18, ....

technically *>CH parts (! but for ...)

Arenes and aryl groups

• arenes = aromatic compounds

• PolyAromatic Hydrocarbons vs e.g. benzene homologues

• aryl groups - any group contaning an aromatic ring

Naphthalene (C₆H₆ -2H + 4*CH =C₁₀H₈)

Anthracene (C_6H₆ -2H + 4*CH =C₁₀H₈)

Phenanthrene (C_6H₆ -2H + 4*CH =C₁₀H₈)

Homologous series

• adjacent molecules differ in -CH₂- group

• C₆H₅H

• C₆H₅CH₂H

• C₆H₅CH₂CH₂H or C₆H₄(CH₂H)

Multiple Select

Name the group molecule!

• benzyl

• phenyl

• tollyl

• aryl

Multiple Select

Name the group molecule!

• benzyl

• phenyl

• tollyl

• aryl

Fill in the Blanks

Fill in the Blanks

Fill in the Blanks

Reactions

Aromatic reactions

IF POSSIBLE: aromacity kept

aromatic compounds do not decolourise bromine water

Poll

Which reaction type may occur to arenes?

• addition

• susbtitution

• both of them

• dependant on example

Some adition reactions

with higly reactive partners

under specific circumtances

Reactions of the benzene ring

Aromatic substitution requires a so-called attack agent: a higly reactive, usually unstable and mostly

charged intermediate particle, which attacks and distorts the π–electron sextet. In order to maintain

aromacity, a hydrogen is released to give valence to the new-comer group or atom.

Catalyst is used to ’develope’ the attack agent.