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

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

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

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

CH 3 CH 2 C─O─CH 3 = O Carbonyl Group Bridge O name this branch 1 st Methyl Propanoate

Name this branch 1 st Ethyl Butanoate Pineapple Bridge O

CH 3  O  C  CH 2  CH 2  CH 3 = O Bridge O Name this branch 1 st Methyl butanoate apple

CH 3 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 -O-C-CH 3 O = Bridge O Name this branch 1 st Octyl Ethanoate orange