trifluoromethanesulfonic acid anhydride in water; 1,2-dichloro-ethane

1: 3-Bromostyrene; 2,2,2-trichloroacetyl chloride With zinc in diethyl ether T=15°C; 2 h; Inert atmosphereSonication; 2: With acetic acid; zinc T=20°C; 0.333333 h; Inert atmosphere; 3: potassium ethylxanthate With 1,4-diaza-bicyclo[2.2.2]octane in N,N-dimethyl-formamide Inert atmosphere;

1: zinc/copper couple; trichlorophosphate / diethyl ether / Reflux 2: acetic acid; zinc / 7 h / 20 - 80 °C View Scheme