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+ d) :OH :OH₂ CH₃ CH₃ + CH₃ H-A CH₃O CH₃O CH₃O H H H OH OH OH CH₃ CH₃ CH₃ A: H H₂O: + H-O H-O + CH₃O CH₃O H CH₃O H H OH OH OH H-A CH₃ CH₃ CH₃ H-O + + H H OH CH₃O H OH OH H 28.43 Step1 Step 2 Step 3 Step 4 Bu₃SnH H₂, Pd PCC Ar C initiator Step 5 Step 6 Step 7 Step 8 O + 1) NaOH, H₂O TsOH - 2) + O Step 9 Step 10 Step 11 + - DIBAH 1) H₃O⁺ + 2) NaOH, H₂O 506