1: With sulfuryl dichloride; 2,2'-azo-bisisobutyronitrile in o-di-fluorobenzene T=75 - 80°C; 4 h; 2: With potassium hydroxide; potassium hydrogencarbonate; potassium iodide in o-di-fluorobenzene; water T=60°C; pH=6.3; Conversion of starting material;