Mass spectra of seventeen bis(alkylmercapto) alkanes of the general formula R.S.CnH2nS R are presented and discussed Major ions occur by· 1) simple C-C or C-S cleavage to give ions of the type R S CmH2m+1+; 2) cleavage of a C-S bond accompanied by hydrogen rearrangement; and 3) further loss of an alkyl group. The consecutive nature of breakdown in cases of double cleavage and rearrangement is established by metastable transitions.
T. H. Shuttleworth, "Mass Spectra of Some Bis(alkylmercapto)alkanes," Appl. Spectrosc. 18, 78-81 (1964)