Trifluoroacetic acid → 2-Thienyl ketone

Participants

Reaction Steps

To a mixture of 12.7 g (0.099 mol) of 2-thienylcarboxylic acid, 8.33 g (0.099 mol) of thiophene, and 34.9 ml of Amberlyst-15 in 250 ml of nitromethane was added 34.9 ml (0.247 mol) of trifluoroacetic acid at room temperature and stirred for 14 h. The reaction mixture was filtered, the filtrate was concentrated in vacuo, and a green oil residue was chromatographed on silica (hexane/methylene chloride 1:1) to afford 8 g (41.6%) of di-(2-thienyl)ketone, as white needles.

Provenance & Evidence