Thiophenol → 4-Tert-Butylbenzenethiol

Temperature

70 °C

To a mixture of 1100 grams (10.0 moles) of thiophenol, and 300 grams of boron trifluoride-phosphoric acid complex was slowly added, with stirring, 620 grams (10.9 moles) of isobutylene at 0° C. After addition was complete the mixture was stirred at 0°-10° C. for two hours. The mixture was then heated to 70° C. and stirred at 70°-75° C. for two hours. The reaction mixture was cooled to 25° C. and the organic layer was separated from the lower catalyst layer and added to 500 ml of toluene. The toluene layer was washed four times with 1000-ml portions of water and then dried with magnesium sulfate. The toluene was evaporated from the mixture in vacuo and the residue was distilled in a 10-tray column to give 1120 grams of 4-(tert-butyl)thiophenol, b.p. 58°-60°/1.00 mm (yield 68%). The nmr spectrum agreed with the structure. The residue from the above distillation was 470 grams of tert-butyl 4-(tert-butyl)phenyl sulfide. Neuworth et al (1963) report b.p. 120°/20 mm for 4-(tert-butyl)thiophenol.

1. additionwas slowly added
2. customat 0° C
3. additionAfter addition
4. stirringwas stirred at 0°-10° C. for two hours
5. stirringstirred at 70°-75° C. for two hours
6. temperatureThe reaction mixture was cooled to 25° C.
7. customthe organic layer was separated from the lower catalyst layer
8. additionadded to 500 ml of toluene
9. washThe toluene layer was washed four times with 1000-ml portions of water
10. dry with materialdried with magnesium sulfate
11. customThe toluene was evaporated from the mixture in vacuo
12. distillationthe residue was distilled in a 10-tray column

ORD record

ord-fc09c60990cf4f2bad57404ccf6b1192

Source dataset

uspto-grants-1981_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04304735