elimination reaction of haloalkanes

Pia Ricioppo
Mind Map by Pia Ricioppo, updated more than 1 year ago
Pia Ricioppo
Created by Pia Ricioppo over 5 years ago
10
2

Description

aqa as level chemistry unit 2- organics

Resource summary

elimination reaction of haloalkanes
1 the reagent for this reaction is ALCOHOLIC sodium or potassium hydroxide.
2 the conditions need to be reflux in alcoholic solution.
3 the product produced is an ALKENE.
4 for example bromopropane and sodium hydroxide...
5 key points
5.1 OH- acts as a base (proton acceptor)
5.1.1 protons come from carbon or the hydrogen ion next to the carbon bonded with halogen
5.1.1.1 electron pair moves to form a second bond (double bond) between the carbon atom
5.1.1.1.1 the halogens displaced
5.1.1.1.1.1 overall theres an elimination of HBR
6 what decides whether you get an elimination or a substituition?
6.1 one very important factor is the type of haloalkane...
6.1.1 primary
6.1.1.1 mainly substituition
6.1.2 secondary
6.1.2.1 substituition and eliminaion
6.1.3 teritary
6.1.3.1 mainly elimination
6.2 the solvent
6.2.1 the proportion of solvent to ethanol MATTERS.
6.2.1.1 water encourages substituition
6.2.1.2 ethanol encourages elimination
6.3 higher temperatures encourage elimination.
6.4 concentration of sodium or potassium hydroxide solution
6.4.1 higher concentrations favour elimination
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