Reactions Of Ester Flashcards
What are the reactions of esters?
Acid/base hydrolysis of an ester
Condensation polymerisation
Acid hydrolysis of an ester
Reforms an alcohol and carboxylic acid using water
In a reversible reaction under reflux
Using dilute hydrochloric acid
Acid hydrolysis is…
The reverse of the condensation of carboxylic acid and an alcohol to form an ester
Catalyst for acid hydrolysis
Dilute acid (H+)
Conditions for acid hydrolysis
Reflux
Dilute acid catalyst
Requires water to break ester bond
Is acid hydrolysis a reversible reaction?
Yes
Acid hydrolysis is adding…
A water molecule to break the ester bond under alkali conditions
Alkali hydrolysis of an ester is,,,
Not a reversible reaction
Under reflux
Using OH- ions to break the ester bond
Products of alkali hydrolysis
A carboxylate ion and alcohol
Wash through with acid to protonate
Is alkali hydrolysis under reflux?
Yes
What is condensation polymerisation?
Forming long ester chains by reacting diols with dicarboxylic acids to form a long molecule held together by ester bonds =polyester
How many water molecules are made in condensation polymerisation?
2 water molecule for every acid (because it has 2 functional groups)
2 water molecule for every alcohol (because it has 2 functional groups)
So therefore double the repeating unit (n) of carboxylic acid and alcohol
