Image's source: chemhelper
This mechanism takes place in alkenes.
Instructions: Follow the links (underlined sentences) below to understand the electrophilic addition mechanism.
2. The reaction with bromine... (Addition of bromine to a carbon-carbon double bond).
ii. Reaction of unsymmetrical alkene with bromine (please refer to 3 (ii)(d)) below.
3. The reaction with hydrogen halide... (Addition of hydrogen bromide)
ii. Reaction of unsymmetrical alkene (Markovnikov addition)
Eg.: The reaction between propene and hydrogen bromide in the gas phase:
CH3CH=CH2 + HBr → CH3CH2BrCH3
ii(a). Carbocations (carbonium ions) and their stability... (Essential pre-reading before you tackle anything else in this section.)
ii(b). Why unsymmetric alkenes are a problem ... (Explains the reasons behind Markovnikov's Rule, and gives a general mechanism for these more awkward reactions. This is also essential reading before you look at specific reactions.)
4. Movie on the mechanism (if you can't see the movie here, try click at the movie file below.)
Size : 0.583 Kb
Type : mov
Organic Chemistry HX to Alkene Reaction.flv
Size : 4.819 Kb
Type : flv