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Treatment of one stereoisomer of 2-iodo-3-phenylbutane

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Treatment of one stereoisomer of (2 ?, 3R)-2-iodo-3-phenylbutane with base, yields (E)-2-phenylbutene.

a) Determine which enantiomer of 2-iodo-3-phenylbutene gives the E product (2R, 3R or 2S, 3R), and explain clearly (using unambiguous diagrams) why that is the case.

b) Assign that enantiomer as either R or S at carbon 2.

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