1: thien-2-yl bromide With iodine; magnesium in tetrahydrofuran T=0°C; insertion; 3.5 h; 2: benzene-1,2-dicarbothioic acid di(S-pyridin-2-yl) ester in tetrahydrofuran T=0°C; Grignard reaction; 0.5 h;

in tetrahydrofuran T=0°C; 0.666667 h;

1: bromobenzene With magnesium in tetrahydrofuran T=30°C; 3.5 h; 2: benzene-1,2-dicarbothioic acid di(S-pyridin-2-yl) ester in tetrahydrofuran T=0°C; 0.25 h; Further stages.;

1.1: magnesium / tetrahydrofuran / 3.5 h / 30 °C 1.2: 67 percent / tetrahydrofuran / 0.25 h / 0 °C 2.1: 67 percent / Lawesson's reagent / CHCl3 / 12 h / Heating View Scheme