1: dimethyl zinc With titanium tetrachloride in dichloromethane; toluene 2: cyclohexyl-(3,5-dimethoxy-phenyl)-methanone in dichloromethane; toluene

1.1: Mg / tetrahydrofuran / Heating 1.2: tetrahydrofuran / 3 h / Heating 1.3: 63.3 percent / aq. HCl / tetrahydrofuran / Heating 2.1: TiCl4 / CH2Cl2; toluene 2.2: 70.3 percent / CH2Cl2; toluene View Scheme

1.1: Mg / tetrahydrofuran / Heating 1.2: tetrahydrofuran / 3 h / Heating 1.3: 63.3 percent / aq. HCl / tetrahydrofuran / Heating 2.1: TiCl4 / CH2Cl2; toluene 2.2: 70.3 percent / CH2Cl2; toluene View Scheme

boron tribromide in dichloromethane T=0°C;