Retention of 1,ω-bis-(dialkylamino)-polysulphides and related compounds in reversed-phase HPLC

Summary

The reaction of secondary amines R₂NH with disulfur dichloride S₂Cl₂ in dichloro methane yields mixtures of bis-dialkylamino polysulphides R₂N−S_n−NR₂ with sulphur chain lengths varying from n_s=2 to 14. The S chains are believed to be non-branched. The compounds form homologous series in each of which sulphur atoms give a constant contribution to retention. The sulphur retention index depends slightly on the carbon number in the terminal alkyl groups R. The presence of nitrogen lowers retention. The index increment of N is ca. −160 units, which is distinctly less negative than values found in alkylamines.