IUPAC Names Remove -e from alkane(or alkene) name,add -oic acid. The carbon of the carboxyl group is #1. CIO H CH:CH-CHC-OH Ph-c=C H COOH 2-chlorobutanoic acid trans-3-phenyl-2-propenoic acid (cinnamic acid) => Chapter 20 Chapter 20 4 IUPAC Names • Remove -e from alkane (or alkene) name, add -oic acid. • The carbon of the carboxyl group is #1. CH3 CH2 CHC Cl OH O 2-chlorobutanoic acid Ph C H C H COOH trans-3-phenyl-2-propenoic acid (cinnamic acid) =>