Br Method 1: 1) t-BUOK 2) H30 3) PCC 4) MeMgBr 5) H2O 6) PCC Method 2: 1) NaOH 2) PCC 3) MeMgBr 4) H20 5) PCC Method 3: 1) Mg 2) 3) Н-0 4) РСС Method 4: 1) Mg 2) 3) Н,0 4) РСС `H
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