Sodium Acetate → 3,5-Difluorotoluene

A mixture of 1-bromomethyl-3,5-difluoro-benzene (75 g, 0.362 mol), Pd/C (5%, 5 g), and sodium acetate (208 g, 2.54 mol) in ether (300 mL) was treated with hydrogen gas (50 psi) in a Parr shaker for 2 days. The mixture was filtered through Celite and the organic solution washed three times with saturated aqueous sodium bicarbonate solution. The aqueous layers were washed with ether and the combined organic layers dried (MgSO4), filtered, and partially concentrated by evaporation using a cold water bath. The volatile product was obtained as a mixture with ether and the ratio (˜3:2, ether:product, g:g) calculated based on 1H NMR integration to determine actual yield (45.5 g 0.355 mol, 98%) of product for scaling reagents in the ensuing reaction. 1H NMR (400 MHz, CDCl3) δ 2.25 (s, 3H), 6.51-6.56 (m, 1H), 6.58-6.60 (m, 2H) ppm.

1. filtrationThe mixture was filtered through Celite
2. washthe organic solution washed three times with saturated aqueous sodium bicarbonate solution
3. washThe aqueous layers were washed with ether
4. dry with materialthe combined organic layers dried (MgSO4)
5. filtrationfiltered
6. concentrationpartially concentrated by evaporation
7. customThe volatile product was obtained as a mixture with ether
8. customto determine actual yield (45.5 g 0.355 mol, 98%) of product
9. customin the ensuing reaction

ORD record

ord-ad5fcdc204eb4129af2001e7e36005fc

Source dataset

uspto-grants-2010_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07790902B2