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Otherwise it is tempting just to assume that the

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Unformatted text preview: think it is important. B A CH 3 A CH 3 CH 3 CH 3 flip same molecule! CH 3 ring-flip racemizes CH 3 2. This problem was dropped because of a printing error (completely my fault, apologies), but here it is again. For the record, a few people did get this problem because they were taking the exam elsewhere. ¾ of them got it wrong again, despite its “repeat” status. The cis molecule has 5 different carbons, but the trans molecule has only four. It is cis. A decent answer to this question demands – demands – three dimensions. Otherwise it is tempting just to assume that the “obviously” more complex trans compound has more signals. Not so. And this problem was done in lecture and on Exam 1. 1 4 1 2 3 5 1 4 2 2 3 4 2 1 3. One molecule has a stereogenic carbon and hence an R/S pair; the other has a (Z,E) pair. That’s all there is to it. Sadly, many of you do not know that alkenes are fl...
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