(i) aq. HBr, (ii) NaNO2, (iii) Cu; Multistep reaction;

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2: (alkaline hydrolysis) View Scheme

1: With n-butyllithium in tetrahydrofuran; cyclohexane T=-75°C; 1.5 h; 2: With boric acid trimethyl ester in tetrahydrofuran; cyclohexane T=-75 - 20°C; 3: With hydrogenchloride in tetrahydrofuran; cyclohexane; water 1 h;