Carbon Dioxide → 2,6-diisopropylbenzoic acid

Temperature

-29 °C

2,6-Diisopropylbromobenzene (21.58 g, 0.0895 mol) was cooled to -23° C. under nitrogen and 2.5M n-butyl lithium in hexanes (36 mL) was added dropwise as the temperature further cooled to -29° C. When the addition was complete, the reaction mixture was warmed to 0° C. and was stirred 1 hour at zero and was then poured onto a large excess of crushed dry ice. The mixture was stirred with a glass rod. When the dry ice had sublimed, hydrochloric acid (1N, 200 mL) was added and the mixture was extracted with ethyl ether, the ether washed with brine, dried (magnesium sulfate), filtered, and concentrated to a yellow oil. The oil was taken up in ether (200 mL), the ether solution extracted with sodium hydroxide solution (1N, 200 mL), the layers separated, the aqueous layer made acidic with 1.5N hydrochloric acid, brine added, and the aqueous layer extracted with ether (200 mL). The ether layer was washed with brine (50 mL), dried (magnesium sulfate), filtered and concentrated to an oil which solidified on standing, 13.42 g, 72.7%.

1. additionWhen the addition
2. temperaturethe reaction mixture was warmed to 0° C.
3. stirringThe mixture was stirred with a glass rod
4. extractionthe mixture was extracted with ethyl ether
5. washthe ether washed with brine
6. dry with materialdried (magnesium sulfate)
7. filtrationfiltered
8. concentrationconcentrated to a yellow oil
9. extractionthe ether solution extracted with sodium hydroxide solution (1N, 200 mL)
10. customthe layers separated
11. additionadded
12. extractionthe aqueous layer extracted with ether (200 mL)
13. washThe ether layer was washed with brine (50 mL)
14. dry with materialdried (magnesium sulfate)
15. filtrationfiltered
16. concentrationconcentrated to an oil which

ORD record

ord-d7e9410391484d949934376f31d498ac

Source dataset

uspto-grants-1998_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05807846