Sodium Hydroxide → 3,5-Dimethoxy-2-methylbenzoic acid

To a solution of methyl 3,5-dimethoxy-2-methylbenzoate (5.83 g, J. C. S. Perkin I, 1973, 2853.) in methanol (80 ml) was added a solution of aqueous sodium hydroxide (10%, 80 ml) and reaction mixture stirred at room temperature for 1 hour. The reaction was then concentrated under reduced pressure to approximately half of the original volume before adding aqueous hydrochloric acid (200 ml). The white precipitate that formed was extracted with ethyl acetate (2×250 ml). The combined extracts were dried over anhydrous magnesium sulphate, filtered and concentrated under reduced pressure to give the sub-title compound as a colourless solid (5.41 g).

1. concentrationThe reaction was then concentrated under reduced pressure to approximately half of the original volume
2. additionbefore adding aqueous hydrochloric acid (200 ml)
3. customThe white precipitate that formed
4. extractionwas extracted with ethyl acetate (2×250 ml)
5. dry with materialThe combined extracts were dried over anhydrous magnesium sulphate
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure

ORD-Eintrag

ord-704fb828a92a419cad79ab0ca6a253e8

Quelldatensatz

uspto-grants-2001_06

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US06242470B1