Zusammenfassung der Ressource
Reactions of Alkenes
- Electrophilic addition
- electrophiles attack the double bond
and are added to the carbon.
- electrophiles are electron pair
acceptors so they are normally positive
- ions like H+ or NO2+
- delta positive part of a molecule
- double bond is nucleophilic
(wants to donate electrons)
- Bromine water test for alkenes
- Shake with bromine water and the solution turns colourless
- Electrophilic addition, as the delta positive bromine is attacked by the double bond
- With hydrogen halides
- electrophilic addition reaction
- when it is an unsymmetrical
alkene, two products are made
- higher carbocation = more stable = more likely
- with water and sulphuric acid catalyst
- electrophilic addition with the sulphuric acid
- hydrolysed to form an alcohol and the
sulphuric acid is regenerated
- Steam hydration
- 300 degrees, 60 atm, phosphoric acid catalyst
- reversible reaction with low yield
- ethene gas recycled to increase yield