potassium hydroxide in tetrahydrofuran; methanol; water T=-10 - 5°C; 0.5 h;

1: 90 percent / potassium hydroxide / tetrahydrofuran; methanol; H2O / 0.5 h / -10 - 5 °C 2: oxalyl chloride / benzene / 1.) RT, 30 min, 2.) reflux, 30 min View Scheme