in tetrahydrofuran 1 h; Heating;

1: 1.) 35percent HCl, sodium nitrite, 2.) cupric chloride, sulfur dioxide, glac. acetic acid / 1.) water, from 10 deg C to 12 deg C, 1 h, 2.) water 2: 97 percent / tetrahydrofuran / 1 h / Heating View Scheme

potassium hydroxide 0.5 h; Heating;