3,4-Dibromo-thiophene; tetrakis(triphenylphosphine) palladium(0); boron trichloride; sodium carbonate 1.) CH2Cl2, -78 deg C, 2 h; -78 deg C to 0 deg C, 8 h, 3.) MeOH, toluene, 110 deg C, 2 h; Yield given. Multistep reaction. Yields of byproduct given;

tetrakis(triphenylphosphine) palladium(0); boron trichloride; sodium carbonate 1.) CH2Cl2, -78 deg C, 2 h; -78 deg C to 0 deg C, 8 h, 3.) MeOH, toluene, 110 deg C, 2 h; Yield given. Multistep reaction. Yields of byproduct given;