Sodium Hydroxide → 2,3-Dimethyl-2,5-cyclohexadiene-1,4-dione

Temperatur

50 °C

A solution of FeCl3.6H2O (81.0 g, 300 mmol) in water (100 mL) was added to a solution of 2,3-dimethyl-benzene-1,4-diol (13.8 g, 100 mmol) in MTBE (150 ml) at ambient temperature. Aqueous sodium hydroxide solution (2.5M, 60 mL, 150 mmol) was added to the vigorously stirring mixture and the reaction heated to 50° C. for 5 hrs. MTBE (150 mL) and water (150 mL) were added and the aqueous layer further extracted with MTBE (2×100 mL). The combined organics were washed with brine (100 mL), dried (Na2SO4), and concentrated to give the intermediate 2,3-dimethyl-[1,4]benzoquinone as an orange-yellow solid (12.0 g, 88%), which was used in the next step without further purification.

1. extractionthe aqueous layer further extracted with MTBE (2×100 mL)
2. washThe combined organics were washed with brine (100 mL)
3. dry with materialdried (Na2SO4)
4. concentrationconcentrated

ORD-Eintrag

ord-891d51e5d0ab4b6a892392537df607ad

Quelldatensatz

uspto-grants-2016_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09278085B2