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Topic: Functional Group #7: Esters Do Now:

Topic: Functional Group #7: Esters Do Now:. Esters. General format R and R ‘ = hydrocarbon branches Can be same or different Esters contain carbonyl group and an O bridge both in middle of chain. O. =. Esters. R  C  O  R ‘ or RCOOR ’

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Topic: Functional Group #7: Esters Do Now:

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  1. Topic: Functional Group #7: EstersDo Now:

  2. Esters • General format • R and R‘ = hydrocarbon branches • Can be same or different • Esters contain carbonyl group andan O bridge • both in middle of chain

  3. O = Esters • RCOR‘ or RCOOR’ • Combination of carboxylic acid & alcohol

  4. Properties • Esters are POLAR • No H bonded to O so no H-bonding • Lower BP then Carboxlyic Acids and Alcohols • Responsible for many distinctive odors

  5. Naming Esters • Name hydrocarbon branch bonded to the bridge O first • branches end in –yl • Base name derived from branch containing carbonyl group • count up all C’s in this branch including the C in the carbonyl • Find the hydrocarbon base name • drop the -e and -oate

  6. O = CH3CH2C─O─CH3 Bridge O Methyl Propanoate name this branch 1st Carbonyl Group

  7. Bridge O Name this branch 1st Ethyl Butanoate • Pineapple

  8. O = CH3OCCH2CH2CH3 Bridge O Name this branch 1st Methyl butanoate • apple

  9. O = CH3CH2CH2CH2CH2CH2CH2CH2-O-C-CH3 Bridge O Name this branch 1st Octyl Ethanoate • orange

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