sulfuric acid; tri-bromide; iron

propane-1-thiol; sodium hydride in dimethyl sulfoxide T=90°C; 48 h;

n-butyllithium in diethyl ether; hexane T=-78°C; 0.5 h;

1: With isopropylmagnesium chloride in tetrahydrofuran T=-20 - 0°C; 0.5 h; 2: With boric acid trimethyl ester in tetrahydrofuran T=20°C; 1 h; 3: With peracetic acid in tetrahydrofuran T=-20 - 20°C; 0.5 h;

butyl lithium in diethyl ether; hexane T=-78°C; 0.25 h;