1: With pyridine; thionyl chloride T=0°C; 0.166667 h; 2: With lithium hexamethyldisilazane in tetrahydrofuran; hexane T=-70°C; 2 h; 3: With 2,2'-azo-bisisobutyronitrile; tri-n-butyl-tin hydride in toluene 0.166667 h; Heating;