What are the E and Z isomers of cinnamic acid?

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Mar 20, 2016

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See below.

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Cinnamic acid is 3-phenylpropenoic acid.

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Each alkene carbon has two different groups, so the molecule can exist as #E//Z# isomers.

(#E#)-Cinnamic acid has the phenyl and #"COOH"# groups on opposite sides of the double bond.

E-Cinnamic

In (#Z#)-cinnamic acid, the phenyl and #"COOH"# groups are on the same side of the double bond.

Z-Cinnamic

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