G. ESTER
Functional group
• Carboxylate group ( -COO- )
General formula
• CnH2n+1COOCmH2m+1
2.7 Analysing ester
State the general formula of ester| Identify the functional group of ester
Naming ester
2.7 Analysing ester
Draw structural formulae of simple esters and name them using the IUPAC nomenclature
Formation of ester
Esterification reaction
• Catalyst:
Concentrated H2SO4
2.7 Analysing ester
Describe the preparation of ester in the laboratory
2.7 Analysing ester
Describe the preparation of ester in the laboratory
Solubility Density
• Slightly soluble in • Low density
water but readily
dissolve in organic Boiling point
solvent
• Low boiling
point
State Physical Odour
properties of
• Simple ester is • Sweet pleasant
colourless liquid at ester smell (fruity
room condition smell)
2.7 Analysing ester
State the physical properties of ethyl ethanoate
Formation of ester
2.7 Analysing ester
Predict the ester produced from the esterification reaction
Naming of ester
2.7 Analysing ester
Predict the ester produced from the esterification reaction
2.7 Analysing ester
Predict the ester produced from the esterification reaction
2.7 Analysing ester
Predict the ester produced from the esterification reaction
Natural sources
Fruit
Pineapple – C3H7COOC2H5
Ethyl butanoate
2.7 Analysing ester
State the natural sources of ester
Flower
Jasmine – CH3COOCH2C6H5
Benzyl ethanoate
2.7 Analysing ester
State the natural sources of ester
Use of ester
• Preparation of cosmetics & perfumes
• Used as food additives (enhance the flavour &
smell of processed food)
• Production of soap & detergent
2.7 Analysing ester
State the uses of ester in everyday life