1: 14 percent / tetrahydrofuran / 3 h / 0 °C 2: 35 percent Spectr. / ethylmagnesium bromide / benzene / 1) 0 deg C, 15 min; 2) reflux, 10 min View Scheme

1: 61 percent / chlorine / CH2Cl2 2: 14 percent / tetrahydrofuran / 3 h / 0 °C 3: 35 percent Spectr. / ethylmagnesium bromide / benzene / 1) 0 deg C, 15 min; 2) reflux, 10 min View Scheme

ethylmagnesium bromide in benzene 1) 0 deg C, 15 min; 2) reflux, 10 min;