- Addition Reactions:
CC
H
H
H
H
+ Br Br
B
CCl 4
An additionreaction
H C
H
r
C
H
Br
H
- Elimination Reactions:
H C
H
H
C
H
Br
H Br)
KOH CC
H
H
H
H
(−H
An elimination reaction (Dehydrohalogenation)
- Rearrangement Reactions:
H+
An rearrangement
CC
CH 3
CH 3
H 3 C
H 3 C
CC
H
H
C
H
CH 3
H 3 C
H 3 C
3.1B MECHANISMS OF REACTIONS
- Mechanism explains, on a molecular level, how the reactants become products.
- Intermediates are the chemical species generated between each step in a
multistep reaction.
- A proposed mechanism must be consistent with all the facts about the reaction
and with the reactivity of organic compounds.
- Mechanism helps us organize the seemingly an overwhelmingly complex body of
knowledge into an understandable form.
3.1C HOMOLYSIS AND HETEROLYSIS OF COVALENT BONDS
- Heterolytic bond dissociation (heterolysis): electronically unsymmetrical bond
