Name these Alkenes HaC CH3 CH3 (a)H2C=CHCHCCH (b)CHCH2CH-CCH2CH CH3 CH3 CH3 (c)CHCH=CHCHCH-CHCHCHs e2004 Thomson-Brooks/Cole
Name these Alkenes
cis-trans Isomers D These two compounds are identical; they are not cis-trans isomers. These two compounds are not identical they are cis-trans isomers. B E @2004 Thomson/Brooks Cole
cis-trans Isomers
E/Z System CH C=C Br geometric isomers of 1-bromo-1-chloropropene ① 2 C--C Zusammen Entgegen For example, (D's together Br CH (D Br CH① CC-C becomes Z H (Z)-1-bromo-1-chloropropene The other isomer is named similarly: ①'s opposite CL CH ② CI CH3① C=C becomes E Br H (1 Br H ② (E)-1-bromo-1-chloropropene
E/Z System
Lower Higher E double bond C( (Higher-priority groups Higher Lower are on opposite sides.) Higher Higher Z double bond (Higher-priority groups are on the same side.) Lower Lower C2004 Thomson-Brooks/Cole
Establish Priority of Substituents on Each sp2 Carbon Low High Low Low priority H priority priority H CH3 priority C卡( High CH Low High CH3 High priority priority priority priority (a)(E)-2-Chloro-2-butene (b)(Z)-2-Chloro-2-butene c2004 Thomson-Brooks/Cole
Establish Priority of Substituents on Each sp2 Carbon