[F:1][C:2]([F:6])([F:5])[CH2:3]Br.O.O.O.O.O.O.O.O.O.[S-2:16].[Na+].[Na+].[S]>[Br-].C([P+](CCCC)(CCCC)CCCC)CCCCCCCCCCCCCCC.O>[F:1][C:2]([F:6])([F:5])[CH2:3][S:16][S:16][CH2:3][C:2]([F:6])([F:5])[F:1]A mixture of 2,2,2-trifluoroethyl bromide (9.8 g), sodium sulphide nonahydrate (14.4 g), sulphur (1.9 g), hexadecyl tributyl phosphonium bromide (1.0 g) and water (18.0 g) was charged to a Carius tube under a nitrogen atmosphere and the tube sealed. The tube was heated to 70° C. for 8 hours, cooled and the contents subjected to steam distillation to give bis-(2,2,2-trifluoroethyl) disulphide as an oil in a yield of 67° C. The product was identified by GC-mass spectroscopy.
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