反应详情

To magnesium turnings (0.160 g, 6.6 mmol) in anhydrous THF (8.0 mL), heated to maintain a mild reflux, was added dropwise 2-bromo-3-dodecylthiophene (23; 2.00 g, 6.0 mmol). The reaction mixture was refluxed for 2 hours before being transferred to a solution of tributyltin chloride (1.80 mL, 6.41 mmol) in 10.0 mL of anhydrous THF at −78° C. The mixture was warmed to room temperature and stirred overnight before being poured into water. The aqueous layer was extracted with hexanes and the combined organic phase was washed with brine and dried over magnesium sulfate. After filtration, the solvent was removed in vacuo to yield 2-tributylstannyl-3-dodecylthiophene (24) as a yellow liquid (3.10 g, 95% yield). 1H NMR (CDCl3): δ 0.90-1.63 (m, 50H), 2.62 (t, 2H), 7.12 (d, 1H, J=4.5 Hz), 7.55 (d, 1H, J=4.5 Hz) ppm.

1. temperatureto maintain a mild reflux
2. temperatureThe reaction mixture was refluxed for 2 hours
3. extractionThe aqueous layer was extracted with hexanes
4. washthe combined organic phase was washed with brine
5. dry with materialdried over magnesium sulfate
6. filtrationAfter filtration
7. customthe solvent was removed in vacuo