Water → Benzeneacetic acid, 4-(1,1-dimethylethyl)-

Methyl 4-t-butylphenylacetate (20 mmol) was dissolved in MeOH (160 mL) and treated with water (40 mL) and LiOH monohydrate (30 mmol). The reaction was allowed to stir at room temperature overnight. Volatiles were removed under reduced pressure; the remaining residue was diluted with water and neutralized to pH 4 with 1 N sulfuric acid. The resulting solids were filtered, washed with water and dried to leave 4-t-butylphenylacetic acid as an off-white solid (3.8 g, 99%). Anhydrous DMF (139 mmol) was cooled to 0° C. and treated with POCl3 (79.6 mmol). After 5 min, 4-t-butylphenylacetic acid (19.9 mmol) was added and the reaction vessel was transferred to a 110° C. oil bath. The reaction mixture was stirred for 2 h, during which all solids dissolved. After cooling to room temperature, the reaction mixture was poured into a stirred solution of NaPF6 (19.8 mmol) in water (200 mL). When precipitation of solids was complete, they were filtered, washed with water, and dried to give XCVII (7.8 g, 97%).

1. customVolatiles were removed under reduced pressure
2. additionthe remaining residue was diluted with water and neutralized to pH 4 with 1 N sulfuric acid
3. filtrationThe resulting solids were filtered
4. washwashed with water
5. customdried

ORD-Eintrag

ord-d49dde3296264212b5876423e8ecf92d

Quelldatensatz

uspto-grants-2003_12

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06660732B2