p97 Tetrasubstituted >Trisubstituted Disubstituted Monosubstituted R R H R H R H R H C=C> C=C C=C> C=C R R R H RR HH H c2004 Thomson-Brooks/Cole
p.97
3.4 Sequence Rules: The E,Zp:42 Designation E,Z标示的次序规则 Neither compound is clearly cis or trans H3C、21C Substituents on cl are C-C different than those on c2 Br We need to define similarity in a precise way to distinguish the two stereoisomers H3C. 2 1,Br Cis/trans nomenclature only C-C works for disubstituted C double bonds
3.4 Sequence Rules: The E,Z Designation E, Z 标示的次序规则 • Neither compound is clearly “cis” or “trans” – Substituents on C1 are different than those on C2 – We need to define “similarity” in a precise way to distinguish the two stereoisomers • Cis/trans nomenclature only works for disubstituted double bonds p.42