Alkyl or aryl disulphide ions are known in solution only as transient species. Stabilisation of inorganic polysulphide ions' S2- in dipolar aprotic media prompted us to try a similar access to organic disulphide ions. Sx2- are easily obtained by addition of sulphur to a S2- solution2 following reaction (1). It should be possible to obtain organic disulphides from the corresponding thiolates by the same procedure. ... However the nucleophilicity of anions such as RS- towards the SS ...
[Baerlocher, Felix Jakob; Baerlocher, Mark Otto; Langler, Richard Francis; MacQuarrie, Stephanie Lee; Marchand, Maurice Emile Australian Journal of Chemistry, 2000 , vol. 53, # 1 p. 1 - 5]