tetrabutyl ammonium fluoride in tetrahydrofuran; hexane; dichloromethane Ambient temperaturestirring overnight; Yield given;

1: tetrabutylammoniumfluorid-hydrat / hexane; tetrahydrofuran; CH2Cl2 / Ambient temperature; stirring overnight 2: 82 percent / brom / acetic acid / 2 h / Ambient temperature View Scheme