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11. How would you synthesize the following compound starting with optically pure (R)-2-butanol (note: it could require multip

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: PPH3 Но Н но о CN Н DEAD, PPH3, NaCN -CHз CH3 CHa Mitsunobu reaction inversion of configuration Hас Hас CN pph PPh3 о

SH CH2Br NaSH Br Br

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