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28.38 protect OH H 1)NaOH H H H 2)CICH₂OCH₃ H H HO CH₃OCH₂O 1) HC=CMgBr 2)H₃O⁺ OH C=CH H H H HO 27.39 1)NaNH₂ CI H H H₂ C C CI Br Lindlar CH₃(CH₂)₇ catalyst 2) CH₂(CH₂)₅CH₂ C=N DMF H₂ H H 1)NaOH, H₂O H H CH₃(CH₂)₁₆CO₂H C=C CN Pd CH₃(CH₂)₇ 2)H₃O⁺ CH₃(CH₂)₇ Stearic acid Oleic acid 503