palladium on activated charcoal in various solvent(s) 0.5 h; Heating;

1: 54 percent / Br2, FeCl3 / CH2Cl2; CCl4 / 1 h 2: 1.) Mg, 1,2-dibromoethane, 2.) B(OMe)3, 3.) NaOH, H2O2 / 1.) THF, reflux, 3 h, 2.) THF, 1 h, 3.) THF, H2O, 0 deg C, 1 h; room temperature, 2 h View Scheme

sodium hydroxide; boric acid trimethyl ester; dihydrogen peroxide; magnesium; ethylene dibromide 1.) THF, reflux, 3 h, 2.) THF, 1 h, 3.) THF, H2O, 0 deg C, 1 h; room temperature, 2 h; Yield given. Multistep reaction;