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Photochemical isomerization of Alkene: cis-1,2-dibenzoylethylene 6-38: What are some clues that tell you that you have made...

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Chemistry

Photochemical isomerization of Alkene:cis-1,2-dibenzoylethylene

6-38: What are some clues that tell you that you have made adifferent isomer product in this reaction?

6-39: Suggest a reason why the starting material(trans-1,4-diphenyl-2-butene-1,4-dione) should be recrystallized(orpure) prior to use ( NOTE: you did not perform therecrystallization, but were provided with the recrystallizedmaterial).

6-40:Cis-and trans-1,4-diphenyl-2-butene-1,4-dione arestereoisomers. What is the specific relationsip between the two ofthem?

6-41:Explain how this photochemical isomerizartion allows theproduction of the thermodynamically less stable cis isomer. Inother words, why is the trans isomer exclusively converted to thecis isomer during short reaction periods and not vice versa? is itpossible, under these conditions, that the trans and cis isomersare in rquilibrium with one another?

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