dipotassium peroxodisulfate; iodine; trifluoroacetic acid in 1,2-dichloro-ethane T=0 - 20°C; 0.416667 h;

1: With dipotassium peroxodisulfate; iodine in 1,2-dichloro-ethane 0.0833333 h; Cooling with ice; 2: With sulfuric acid; trifluoroacetic acid in water; 1,2-dichloro-ethane T=60°C; Cooling with ice;

(i) Hg(CF3CO2)2, (ii) NaI3; Multistep reaction;