Esters

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  • Created by: J.E.C.
  • Created on: 09-04-14 18:58
Esters are formed when an alcohol reacts with a ___ ___?
Carboxylic acid
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What acid catalyst would you use to speed up this reaction
Concentrated Sulphuric or Hydrochloric Acid
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The ester link is formed by the condensation reaction of...?
The hydroxyl group of the alcohol and the carboxyl group in the carboxylic acid.
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The reaction is ___ and eventually comes to ___?
reversible, equilibrium
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The reverse reaction is called?
Ester Hydrolysis
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Give 2 uses of esters?
Food flavourings and perfumes
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How do you name the ester from the acid and alcohol from which they are derived?
Alcohol first ending in -yl then acid ending in -oate e.g.phenyl benzoate
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Polyesters are ___ polymers, formed by reacting...?
condensation, a diol with a dicarboxylic acid
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What is ethanoylation?
When ethanoic acid is involved in esterification
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How is ethanoic anhydride different?
It is a more vigorous ethanoylating agent that has had a molecule of water removed from between two ethanoic acid molecules.
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Ethanoyl Chloride is a more reactive ethanoylating agent but it is...?
Toxic and hazardous
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Acylating agents substitute an acyl group for...?
The H on an -OH group.
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You can only esterify a phenol by adding an ___ ___ but alcohols use this or are reacted with a carboxylic acid in the presence of an ___ ___?
acylating agent, acid catalyst
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When making an ester from phenol it must be carried out in the absence of water but what other conditions apply when using an acid anhydride or acyl chloride?
Acid anhydride: heat under reflux. Acyl Chloride: room temperature.
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A catalyst is effective for both directions of a reversible reaction because excess water displaces the equilibrium to the ___ and the yield is ___?
right, improved
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You can also hydrolyse an ester with an alkali, this produces a ___ ___? This process is usually preferred to acid hydrolysis because...?
Carboxylate salt. It goes to completion.
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Other cards in this set

Card 2

Front

What acid catalyst would you use to speed up this reaction

Back

Concentrated Sulphuric or Hydrochloric Acid

Card 3

Front

The ester link is formed by the condensation reaction of...?

Back

Preview of the front of card 3

Card 4

Front

The reaction is ___ and eventually comes to ___?

Back

Preview of the front of card 4

Card 5

Front

The reverse reaction is called?

Back

Preview of the front of card 5
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