sulfuryl dichloride in tetrachloromethane T=0 - 22°C;

1.1: lithium diisopropylamide / tetrahydrofuran / 0.5 h / 0 °C 1.2: tetrahydrofuran / 0.67 h / -18 °C 2.1: 485 mg / oxalic acid / tetrahydrofuran; H2O / 6 h / 27 °C 3.1: 81 percent / sulfuryl chloride / CCl4 / 0 - 22 °C View Scheme

1.1: lithium diisopropylamide / tetrahydrofuran / 0.5 h / 0 °C 1.2: tetrahydrofuran / 0.67 h / -18 °C 2.1: 485 mg / oxalic acid / tetrahydrofuran; H2O / 6 h / 27 °C 3.1: 81 percent / sulfuryl chloride / CCl4 / 0 - 22 °C View Scheme

lithium carbonate; lithium bromide in N,N-dimethyl-formamide T=120°C; 1 h;