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Solutions to Problems 185 Now: Recall Problem 55! + MgBr CH₃CH₂CHO + Synthesis Starting materials CH₃CH₂CH, Br, Br 1. Mg 1. PBr₃ o 2. Mg OH 2. CH₃CH₂CH 3. CH₃CH₂CH 1. PBr₃ 2. NaSH 3. product (b) Retrosynthetic analysis CH₃ CH₃ CH₂CH₃ CH₂CH₃ CH₃ CH₃ Via RBr HCH + CH₂CH₃ CH₂CH₃ CH₃ CH₂CH₃