The EñZ system

• Distinguishes cis and trans geometrical isomers

• A group on each end is given preference using atomic number of attached atom

• If these are on the same side ó cis ó we have the Z-form. "Z" stands for "zusamen"

• If these are on opposite side ó transó we have the E-form. "E" stands for "entgegen"

30

C

C

H

H

C

C

H

H

trans

cis

and

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