Topic 22-Aromatic chemistry Flashcards

1
Q

Benzene structure

A

-Planar Cyclic structure
- Has rings of delocalised electrons
- Length of bonds is between double and single bond

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2
Q

Why is benzene stable?

A

It has delocalised pi bonds

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3
Q

Aromatic compounds which use benzene naming

A

Chlorobenzene
Nitrobenzene
1,3 Dimethyl Benzene

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4
Q

Aromatic compounds which use phenyl

A

Phenol
Phenylamine

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5
Q

Conditions for nitration

A

50degrees
Benzene
Sulfuric and Nitric acid

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6
Q

Uses of nitration reactions

A

dyes and pharmeceuticals

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7
Q

Equation for the production of electrophile
(Nitration)

A

2H2SO4 + HNO3 –> NO2+ 2HSO4- + H3O+

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8
Q

Equation for the production of electrophile
(Acylation)

A

CH3COCl + AlCl3 –> AlCl4- + Ch3CO+

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9
Q

Regeneration of the catalyst
(Acylation)

A

AlCl4- + H+ –> AlCl3 + HCl

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10
Q

Reagents and conditions for Friedel Craft’s Acylation

A

Reagents: Acyl chloride
Catalyst: AlCl3
Conditons: anhydrous to prevent reaction of AlCl3

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11
Q

What can nitration of aromatic compounds be used for

A

Manufacture of explosives
Formation of amines

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12
Q

What used to hydrogenate benzene

A

Nickel catalyst and hydrogen

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13
Q

How was kekule structure disproven

A

Bond length different from both C-C and C=C
Hydrogenation of benzene was less exothermic than expected
Didnt react with Br2 as expected

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14
Q

Why dont electrophiles undergo reactions with benzene under standard conditions?

A

Would destroy stable ring of delocalised electrons

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15
Q

Why wont chlorobenzene react with nucleohpiles

A

Area of high electron density repels nucleophiles

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