Sv2 Competes with E2 Depends on the Nature of the Nucleophile Substitution Elimination CH:CO2 OAc wk.base CH:CHCH3 CH2=CHCH3 Br 100% 0% CHCHCH3 CH3CH2O QEt CH:CHCH3 CH2=CHCH3 str.base 20% 80% SN2 Competes with E2 C H3 CHCH3 Br C H3 C O2 wk. base C H3 C H2 O Substitution Elimination OAc C H3 CHCH3 OEt C H3 CHCH3 str. base C H2 =CHCH3 C H2 =CHCH3 100% 0% 20% 80% Depends on the Nature of the Nucleophile