Thermolysis of bismuth(iii) dithiolates toward cyclic disulfides with tunable ring size and near-unity conversion

Cyclic disulfides (CH 2 ) n S 2 ( n = 3, 4, 5) are efficiently prepared via solventless pyrolysis of Bi( iii ) dithiolates Bi 2 [S(CH 2 ) n S] 3 obtained from the reaction of Bi 2 O 3 and dithiols.