Electrophilic addition reactions of alkenes There are some
- Slides: 19
Electrophilic addition reactions of alkenes. There are some questions in the middle part of the presentation so have a pen and paper ready. There is some narration so turn the sound on!
Electrophilic addition. Ethene and bromine liquid at room temperature.
H H C H Electrophile Polarised
Carbocation H H C C C + H H Br δ+ __ δBr H H H C Brδ+ BrδCurly arrows H
H H H C C+ H H + Br Brδ+ __ δBr Bromide ion H
Electrophilic addition Saturated H H H C C Br Br H 1, 2 -dibromoethane Unsaturated
H H C C Brδ+ H H Mechanism H C C+ Br __ Brδ H C C+ H Br BrδH H __ δ Br H H C C Br Br H
Write down the answers to the questions on a piece of paper. You will be given the answers in the final part of the presentation.
Electrophilic addition. Ethene and bromine liquid at room temperature.
H H C H
H H C C C + H H Br δ+ __ δBr H H H Brδ+ Brδ- C H
H H H C C+ + Brδ+ Br __ δBr H
H H H C C Br Br H
Q 1. From red-brown to colourless (not clear). Ethene and bromine liquid at room temperature.
H H C H Q 2. Ethene is unsaturated because it has a double bond between carbon atoms. Q 3. The δ+ end of the Br 2 acts as an electrophile
Q 5. The carbon only has a single + charge because only one of the shared pair of electrons belonged to this carbon. H H C C C + H H Br δ+ __ δBr H H H Brδ+ Brδ- Q 4. There is a single – charge because one of the shared pair of electrons already belonged to this bromine. C H
Q 6. A carbocation. H H H C C+ + Brδ+ Br __ δBr H Q 7. Curly arrows represent movement of a pair of electrons.
Q 8. The product is saturated. All the bonds between carbon atoms are saturated. H H H C C Br Br H Q 9. 1, 2 -dibromoethane Q 10. Electrophilic addition.
Well done!
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