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Why would two (E/Z) isomers occur in stilbenes and not in the product 2-Acetyl-3-phenyl-acrylic acid methyl...

Why would two (E/Z) isomers occur in stilbenes and not in the product 2-Acetyl-3-phenyl-acrylic acid methyl ester?

What is an experiment that could separate and isolate stilbene isomers?

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