1: dimethyl zinc With titanium tetrachloride in dichloromethane; toluene T=-30°C; 0.5 h; 2: 1-(3,5-dimethoxyphenyl)-7-phenoxyheptan-1-one in dichloromethane; toluene T=20°C; 6 h; Further stages.;

1: TiCl4 / CH2Cl2 / 4 h / -30 - 20 °C 2: BBr3 / CH2Cl2 / -78 - 20 °C View Scheme