Naoh/ho CH) COH + CH),C=CH ( CH)a c Br 93% 7% Naoh/EtoH (CH3)3C-OEt +(CH3)2C=CH2 <3% >97%(CH 93% 7% 3 )3C Br NaOH / H2O (CH3 )3C OH + (CH3 )2C=CH2 NaOH / EtOH (CH3 )3C OEt + (CH3 )2C=CH2 ＜ 3% ＞ 97%