Iodine → Ethanone, 2-chloro-2,2-difluoro-1-(2-methylphenyl)-

Magnesium (flake, 6.2 g) was suspended in diethyl ether (10 mL), and iodine (small amount) was added and a solution of 2-bromotoluene (43.26 g) in diethyl ether (100 mL) were slowly added dropwise. After stirring at room temperature for 1 hr, the reaction mixture was added dropwise to a solution of chlorodifluoroacetic acid (10.0 g) in diethyl ether (100 mL) at −10° C., and the mixture was stirred at 0° C. for 1 hr. Saturated aqueous ammonium chloride solution was added to the reaction mixture, and the mixture was extracted with diethyl ether. The extract was washed with saturated brine, dried over magnesium sulfate, and concentrated under reduced pressure. The residue was distilled under reduced pressure (boiling point: 81-82° C./12-13 mmHg) to give the title compound as a pale-yellow oil (yield 4.9 g, 31%).

1. stirringthe mixture was stirred at 0° C. for 1 hr
2. extractionthe mixture was extracted with diethyl ether
3. washThe extract was washed with saturated brine
4. dry with materialdried over magnesium sulfate
5. concentrationconcentrated under reduced pressure
6. distillationThe residue was distilled under reduced pressure (boiling point: 81-82° C./12-13 mmHg)

ORD record

ord-9afed727a0dd4a9e8eb5b803d5342738

Source dataset

uspto-grants-2013_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08436187B2