a. b. Me Me 'Br Brz 2 KOtBu NaNH, Hz (g) CH₂Cl₂ HO-Bu BnBr Lindlar's A DMF cat. Me CH₂P (Ph)3-CPBA Mg (s) THF H₂SO4 A CH₂Cl₂ (H₂O) -Ph Me Me -Me

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