Toluene → 3-(2-Hydroxypropan-2-yl)phenol

Temperatur

70 °C

To a solution of 1088 grams (8 moles) of 3-hydroxyacetophenone in 13.25 liters of tetrahydrofuran was added in a nitrogen atmosphere, over 40 minutes, a solution of 10,000 grams (20 moles) of a commercially prepared 2 M solution of methylmagnesium bromide in a mixture of equal weights of tetrahydrofuran and toluene. The mixture was stirred with a turbine stirrer during the addition. Stirring was continued as the mixture was heated under reflux (70° C.) for three hours. A solution of 5.6 liters of saturated aqueous ammonium chloride solution in 2.4 liters of water was then added and the mixture was stirred for one hour at room temperature. It was allowed to stand for one hour, the aqueous and organic layers were separated and the organic layer was washed with 7.5 liters of water, after which the tetrahydrofuran was removed by distillation. There was added 7600 ml. of a 10% aqueous solution of sodium hydroxide, and the mixture was again distilled until all tetrahydrofuran and toluene had been removed. The aqueous residue was filtered and acidified with concentrated hydrochloric acid. The precipitated solids were filtered, washed with cold water and dried to yield the desired 3-hydroxyphenyldimethylcarbinol. The yield was 976 grams, or 80% of theoretical.

1. stirringStirring
2. temperaturewas heated
3. stirringthe mixture was stirred for one hour at room temperature
4. customthe aqueous and organic layers were separated
5. washthe organic layer was washed with 7.5 liters of water
6. customafter which the tetrahydrofuran was removed by distillation
7. additionThere was added 7600 ml
8. distillationof a 10% aqueous solution of sodium hydroxide, and the mixture was again distilled until all tetrahydrofuran and toluene
9. customhad been removed
10. filtrationThe aqueous residue was filtered
11. filtrationThe precipitated solids were filtered
12. washwashed with cold water
13. customdried

ORD-Eintrag

ord-1210975dcefc484cac48256a20774bfa

Quelldatensatz

uspto-grants-1984_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US04460800