NaBO3 in methanol; water 2 h; Ambient temperature;

indium(III) chloride tetrahydrate in ethanol T=20°C; 24 h; Inert atmosphere;

sulfur in sulfolane

1: potassium fluoride; chlorine / acetonitrile / 20 °C / Cooling with ice; Inert atmosphere 2: ZnF2 / 15 h / 120 °C / Inert atmosphere View Scheme

1: p-(trifluoromethoxy)-benzaldehyde With n-butyllithium; N,N,N'-trimethyl-ethylenediamine in tetrahydrofuran T=-20°C; 21 h; 2: bis-(2-fluorophenyl)-disulfide With n-butyllithium in tetrahydrofuran T=-40°C; 3 h;