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Unformatted text preview: CH 3 Ph CH 3 h Ph CH 3 CH 3 For this one, we need to think about the reverse reaction (remember, it's an equilibrium favoring the butadiene form), which, under photochemical conditions, is dis rotatory. If it's disrotatory in one direction, then it's disrotatory in the other direction: Ph CH 3 CH 3 H Ph CH 3 CH 3 There is one other issue here, namely, that there are, in principle, two different disrotatory pathways. It stands to reason that the Ph and CH 3 groups will rotate away from each other as shown, and not toward each other, which would be the other possible disrotatory pathway....
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