in benzene 3 h; Irradiation;

1: 1.) 1.32 N BuLi / 1.) -25 deg C, 4 h; 2.) -15 deg C, 1 h; 3.) r.t., 16 h 2: 71 percent / Na2CO3; Br2 / 1.) -25 deg C, 2 h; 2.) room temp., 1.5 h 3: 42 percent Chromat. / Amberlite IR-120 / tetrahydrofuran; H2O / 1 h / Ambient temperature 4: 72 percent / benzene / 3 h / Irradiation View Scheme

1: 71 percent / Na2CO3; Br2 / 1.) -25 deg C, 2 h; 2.) room temp., 1.5 h 2: 42 percent Chromat. / Amberlite IR-120 / tetrahydrofuran; H2O / 1 h / Ambient temperature 3: 72 percent / benzene / 3 h / Irradiation View Scheme

in benzene 4 h; Irradiation;

1: 70 percent / Na2CO3, Br2 / 1.) -25 degC, 2 h; 2.) r.t., 1.5 h 2: Amberlite IR-120 / tetrahydrofuran; H2O / 1 h / Ambient temperature 3: benzene / 3 h / Irradiation; 100 W Hanovia medium pressure mercury lamp View Scheme

1: 42 percent Chromat. / Amberlite IR-120 / tetrahydrofuran; H2O / 1 h / Ambient temperature 2: 72 percent / benzene / 3 h / Irradiation View Scheme

1: Amberlite IR-120 / tetrahydrofuran; H2O / 1 h / Ambient temperature 2: benzene / 3 h / Irradiation; 100 W Hanovia medium pressure mercury lamp View Scheme

in benzene 3 h; Irradiation100 W Hanovia medium pressure mercury lamp;