lithium bromide in tetrahydrofuran 15 h; Ambient temperature;

1: 1.) Mg, dibromoethane / 1.) THF, RT, 2 h, 2.) THF, RT, 15 h 2: 0.738 g / oxalic acid / methanol / 6 h / Ambient temperature 3: 1.068 g / Et3N / tetrahydrofuran / 2 h / Ambient temperature 4: 997 mg / LiBr / tetrahydrofuran / 15 h / Ambient temperature View Scheme

1: 1.068 g / Et3N / tetrahydrofuran / 2 h / Ambient temperature 2: 997 mg / LiBr / tetrahydrofuran / 15 h / Ambient temperature View Scheme

1: 0.738 g / oxalic acid / methanol / 6 h / Ambient temperature 2: 1.068 g / Et3N / tetrahydrofuran / 2 h / Ambient temperature 3: 997 mg / LiBr / tetrahydrofuran / 15 h / Ambient temperature View Scheme