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1) Suggest a reason why the starting material (trans-1,4-diphenyl-2-butene-1,4-dione) should be recrystallized prior to use in the photochemical isomerization of an alkene.

2) cis and trans-1,4-diphenyl-2-butene-1,4-dione are stereoisomers. What is the specific relationship between the two of them?

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