chromium dichloride in tetrahydrofuran 4 h; Heating;

1: 2-chloro-acetophenone With potassium hexamethylsilazane in tetrahydrofuran; toluene T=-85°C; 0.166667 h; 2: hydratropic aldehyde in tetrahydrofuran; toluene T=-85°C; 0.25 h;