1,3-Propanedithiol → 2-(4-bromophenyl)-5,6-dihydro-4H-1,3-dithiin-1-ium trifluoromethanesulfonate

Participants

Reaction Steps

48.64 g (242 mmol) of 4-bromobenzoic acid, 31.8 ml (314 mmol) of propane-1,3-dithiol and 27.9 ml (314 mmol) of trifluoromethanesulfonic acid are refluxed in 1.61 of a mixture 1/1 isooctane/toluene for 18 hours. The mixture is cooled down and the product is precipitated by addition of 1.51 of TBME to yield 75 g of 2-(4-bromophenyl)-5,6-dihydro-4H-1,3-dithiin-1-ium trifluoromethanesulfonate as yellow crystals.

Provenance & Evidence