Potassium Hydroxide → 2-(2,6-Dichlorophenyl)acetyl chloride

Temperature

80 °C

A solution of (2,6-dichloro-phenyl)-acetonitrile (Intermediate A1) (commercially available at Aldrich) (18.6 g, 100 mmol) in ethanol (40 mL) and water (50 mL) was treated with KOH (30 g) and the mixture was heated to 80° C. for 20 h. The mixture was quenched with HCl until pH 3. The product was extracted with chloroform (5×50 mL). The extracts were combined, dried over MgSO4, filtered and evaporated to dryness. The product was (2,6-dichloro-phenyl)-acetic acid, 17 g (83%). A solution of (2,6-dichloro-phenyl)-acetic acid (10 g, 49 mmol) in benzene (200 mL) was treated with oxalyl chloride (32 mL, 2M in dichloromethane) followed by a few drops of dimethyl formamide. The mixture was allowed to stir for 3.5 h at rt. The solvent was removed under vacuum to give ˜11.5 g of (2,6-dichloro-phenyl)-acetyl chloride (Intermediate A2).

1. customThe mixture was quenched with HCl until pH 3
2. extractionThe product was extracted with chloroform (5×50 mL)
3. dry with materialdried over MgSO4
4. filtrationfiltered
5. customevaporated to dryness
6. customThe solvent was removed under vacuum

ORD record

ord-8fe3e010af8345ec97cab18fb6c013d5

Source dataset

uspto-grants-2012_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08178571B2