反应详情

A mixture of 29.7 g (0.13 mole) of 2-(m-trifluoromethylphenyl)thiophene, 200 ml of reagent carbon tetrachloride, 15.5 ml (18.8 g 0.13 mole) of benzene sulfenyl chloride and 0.05 g of iron powder was allowed to stand 4 days at room temperature. The reaction mixture was found by vapor phase chromatography to contain approximately equal amounts of 2-(m-trifluoromethylphenyl)thiophene, diphenyl disulfide and the desired disubstituted thiophene. An additional 12.7 ml (0.11 mole) of benzenesulfenyl chloride and 0.05 g of iron powder were added. The mixture was stirred 2 hours at room temperature and then 1 hour at reflux. The carbon tetrachloride solvent was removed by distillation. The residue was distilled at reduced pressure to give 17 g (39%) of 2-phenylthio-5-(m-trifluoromethylphenyl)thiophene b.p. 172°-210° C. (0.04 mm), nD21 =1.6329-1.6330.

1. temperature1 hour at reflux
2. customThe carbon tetrachloride solvent was removed by distillation
3. distillationThe residue was distilled at reduced pressure